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<?php /** * @link http://github.com/myclabs/php-enum * @license http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file) */ namespace MyCLabs\Enum; /** * Base Enum class * * Create an enum by implementing this class and adding class constants. * * @author Matthieu Napoli <matthieu@mnapoli.fr> * @author Daniel Costa <danielcosta@gmail.com> * @author Mirosław Filip <mirfilip@gmail.com> * * @psalm-template T * @psalm-immutable * @psalm-consistent-constructor */ abstract class Enum implements \JsonSerializable { /** * Enum value * * @var mixed * @psalm-var T */ protected $value; /** * Enum key, the constant name * * @var string */ private $key; /** * Store existing constants in a static cache per object. * * * @var array * @psalm-var array<class-string, array<string, mixed>> */ protected static $cache = []; /** * Cache of instances of the Enum class * * @var array * @psalm-var array<class-string, array<string, static>> */ protected static $instances = []; /** * Creates a new value of some type * * @psalm-pure * @param mixed $value * * @psalm-param T $value * @throws \UnexpectedValueException if incompatible type is given. */ public function __construct($value) { if ($value instanceof static) { /** @psalm-var T */ $value = $value->getValue(); } $this->key = static::assertValidValueReturningKey($value); /** @psalm-var T */ $this->value = $value; } public function __wakeup() { if ($this->key === null) { $this->key = static::search($this->value); } } /** * @param mixed $value * @return static * @psalm-return static<T> */ public static function from($value): self { $key = static::assertValidValueReturningKey($value); return self::__callStatic($key, []); } /** * @psalm-pure * @return mixed * @psalm-return T */ public function getValue() { return $this->value; } /** * Returns the enum key (i.e. the constant name). * * @psalm-pure * @return string */ public function getKey() { return $this->key; } /** * @psalm-pure * @psalm-suppress InvalidCast * @return string */ public function __toString() { return (string)$this->value; } /** * Determines if Enum should be considered equal with the variable passed as a parameter. * Returns false if an argument is an object of different class or not an object. * * This method is final, for more information read https://github.com/myclabs/php-enum/issues/4 * * @psalm-pure * @psalm-param mixed $variable * @return bool */ final public function equals($variable = null): bool { return $variable instanceof self && $this->getValue() === $variable->getValue() && static::class === \get_class($variable); } /** * Returns the names (keys) of all constants in the Enum class * * @psalm-pure * @psalm-return list<string> * @return array */ public static function keys() { return \array_keys(static::toArray()); } /** * Returns instances of the Enum class of all Enum constants * * @psalm-pure * @psalm-return array<string, static> * @return static[] Constant name in key, Enum instance in value */ public static function values() { $values = array(); /** @psalm-var T $value */ foreach (static::toArray() as $key => $value) { $values[$key] = new static($value); } return $values; } /** * Returns all possible values as an array * * @psalm-pure * @psalm-suppress ImpureStaticProperty * * @psalm-return array<string, mixed> * @return array Constant name in key, constant value in value */ public static function toArray() { $class = static::class; if (!isset(static::$cache[$class])) { /** @psalm-suppress ImpureMethodCall this reflection API usage has no side-effects here */ $reflection = new \ReflectionClass($class); /** @psalm-suppress ImpureMethodCall this reflection API usage has no side-effects here */ static::$cache[$class] = $reflection->getConstants(); } return static::$cache[$class]; } /** * Check if is valid enum value * * @param $value * @psalm-param mixed $value * @psalm-pure * @psalm-assert-if-true T $value * @return bool */ public static function isValid($value) { return \in_array($value, static::toArray(), true); } /** * Asserts valid enum value * * @psalm-pure * @psalm-assert T $value */ public static function assertValidValue($value): void { self::assertValidValueReturningKey($value); } /** * Asserts valid enum value * * @psalm-pure * @psalm-assert T $value */ private static function assertValidValueReturningKey($value): string { if (false === ($key = static::search($value))) { throw new \UnexpectedValueException("Value '$value' is not part of the enum " . static::class); } return $key; } /** * Check if is valid enum key * * @param $key * @psalm-param string $key * @psalm-pure * @return bool */ public static function isValidKey($key) { $array = static::toArray(); return isset($array[$key]) || \array_key_exists($key, $array); } /** * Return key for value * * @param mixed $value * * @psalm-param mixed $value * @psalm-pure * @return string|false */ public static function search($value) { return \array_search($value, static::toArray(), true); } /** * Returns a value when called statically like so: MyEnum::SOME_VALUE() given SOME_VALUE is a class constant * * @param string $name * @param array $arguments * * @return static * @throws \BadMethodCallException * * @psalm-pure */ public static function __callStatic($name, $arguments) { $class = static::class; if (!isset(self::$instances[$class][$name])) { $array = static::toArray(); if (!isset($array[$name]) && !\array_key_exists($name, $array)) { $message = "No static method or enum constant '$name' in class " . static::class; throw new \BadMethodCallException($message); } return self::$instances[$class][$name] = new static($array[$name]); } return clone self::$instances[$class][$name]; } /** * Specify data which should be serialized to JSON. This method returns data that can be serialized by json_encode() * natively. * * @return mixed * @link http://php.net/manual/en/jsonserializable.jsonserialize.php * @psalm-pure */ public function jsonSerialize() { return $this->getValue(); } }