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<?php |
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/** |
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* Created by enea dhack - 08/07/2020 16:59. |
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*/ |
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namespace Vaened\Enum; |
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use BadMethodCallException; |
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use ReflectionClass; |
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use Stringable; |
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use UnexpectedValueException; |
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use function array_reduce; |
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abstract class Enum implements Enumerable, Stringable |
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{ |
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private string|int|float|bool $value; |
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private static array $attributes = []; |
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private static array $cache = []; |
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final private function __construct(string|int|float|bool $value) |
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{ |
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if (! self::isValid($value)) { |
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throw new UnexpectedValueException("Value '$value' is not part of the enum " . static::class); |
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} |
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$this->value = $value; |
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} |
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public static function create(string|int|float|bool $value): static |
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{ |
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return new static($value); |
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} |
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public static function instantiate(string $key): static |
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{ |
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$values = static::associates(); |
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if (! isset($values[$key])) { |
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throw new UnexpectedValueException("Key '$key' is not part of the enum " . static::class); |
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} |
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return static::create($values[$key]); |
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} |
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public static function isValid(string|int|float|bool $value): bool |
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{ |
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return in_array($value, static::associates(), true); |
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} |
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public static function values(): array |
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{ |
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return array_map(static fn(string|int|float|bool $value) => static::create($value), static::associates()); |
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} |
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private static function associates(): array |
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{ |
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$classname = static::class; |
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return self::$cache[$classname] ??= static::getConstantsFrom($classname); |
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} |
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private static function getConstantsFrom(string $classname): array |
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{ |
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return (new ReflectionClass($classname))->getConstants(); |
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} |
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private static function getEnumAttributes(): array |
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{ |
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return self::$attributes[static::class] ??= static::bindEnumAttributes(); |
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} |
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private static function bindEnumAttributes(): array |
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{ |
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return array_reduce(static::attributes(), static function (array $acc, Attributor $attribute): array { |
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$acc[$attribute->getCase()] = $attribute->getAttributes(); |
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return $acc; |
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}, []); |
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} |
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protected static function attributes(): array |
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{ |
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return []; |
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} |
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public function value(): string|int|float|bool |
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{ |
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return $this->value; |
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} |
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public function key(): string |
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{ |
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return array_search($this->value, static::associates(), true); |
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} |
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public function equals(string|int|float|bool $value): bool |
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{ |
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return $this->value() === $value; |
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} |
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protected function attribute(string $name): mixed |
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{ |
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$constants = static::getEnumAttributes(); |
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$attributes = $constants[$this->key()] ?? []; |
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return $attributes[$name] ?? null; |
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} |
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public static function __callStatic(string $name, array $arguments): self |
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{ |
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$values = static::associates(); |
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if (isset($values[$name])) { |
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return static::create($values[$name]); |
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} |
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throw new BadMethodCallException("No static method or enum constant '$name' in enum " . static::class); |
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} |
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public function __toString(): string |
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{ |
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return $this->value(); |
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} |
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} |
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vaened /
php-enum
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