<?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, \Stringable
{
    /**
     * 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();
        }

        /** @psalm-suppress ImplicitToStringCast assertValidValueReturningKey returns always a string but psalm has currently an issue here */
        $this->key = static::assertValidValueReturningKey($value);

        /** @psalm-var T */
        $this->value = $value;
    }

    /**
     * This method exists only for the compatibility reason when deserializing a previously serialized version
     * that didn't had the key property
     */
    public function __wakeup()
    {
        /** @psalm-suppress DocblockTypeContradiction key can be null when deserializing an enum without the key */
        if ($this->key === null) {
            /**
             * @psalm-suppress InaccessibleProperty key is not readonly as marked by psalm
             * @psalm-suppress PossiblyFalsePropertyAssignmentValue deserializing a case that was removed
             */
            $this->key = static::search($this->value);
        }
    }

    /**
     * @param mixed $value
     * @return static
     */
    public static function from($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
     * @param mixed $value
     */
    public static function assertValidValue($value): void
    {
        self::assertValidValueReturningKey($value);
    }

    /**
     * Asserts valid enum value
     *
     * @psalm-pure
     * @psalm-assert T $value
     * @param mixed $value
     * @return string
     */
    private static function assertValidValueReturningKey($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
     */
    #[\ReturnTypeWillChange]
    public function jsonSerialize()
    {
        return $this->getValue();
    }
}

• [D] PHPUnit
• [F] Enum.php
  Delete

Blog Section

Discover the Latest in Digital Payments and NFC Technology

Dive into our blog to explore the cutting-edge trends in digital payments and NFC technology. Stay updated on the innovations that are revolutionizing transactions, boosting security, and making payments quicker and more convenient. Learn how these advancements are shaping the future of financial interactions and driving the global transition towards a cashless world.

The Rise of Contactless Payments:...

In recent years, contactless payments have surged in popularity, driven...

Visit Blog

March 27, 2024

Enhancing Payment Security: The Role...

As digital transactions proliferate, ensuring robust payment security is more critical than ever. Two foundational...

Visit Blog

March 27, 2024

The Future of Digital Wallets:...

Digital wallets have fundamentally transformed how we manage money, offering a streamlined, secure, and highly...

Visit Blog

March 27, 2024