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<?php
declare(strict_types = 1);
namespace DASPRiD\Enum;
use DASPRiD\Enum\Exception\CloneNotSupportedException;
use DASPRiD\Enum\Exception\IllegalArgumentException;
use DASPRiD\Enum\Exception\MismatchException;
use DASPRiD\Enum\Exception\SerializeNotSupportedException;
use DASPRiD\Enum\Exception\UnserializeNotSupportedException;
use ReflectionClass;
abstract class AbstractEnum
{
/**
* @var string
*/
private $name;
/**
* @var int
*/
private $ordinal;
/**
* @var array<string, array<string, static>>
*/
private static $values = [];
/**
* @var array<string, bool>
*/
private static $allValuesLoaded = [];
/**
* @var array<string, array>
*/
private static $constants = [];
/**
* The constructor is private by default to avoid arbitrary enum creation.
*
* When creating your own constructor for a parameterized enum, make sure to declare it as protected, so that
* the static methods are able to construct it. Avoid making it public, as that would allow creation of
* non-singleton enum instances.
*/
private function __construct()
{
}
/**
* Magic getter which forwards all calls to {@see self::valueOf()}.
*
* @return static
*/
final public static function __callStatic(string $name, array $arguments) : self
{
return static::valueOf($name);
}
/**
* Returns an enum with the specified name.
*
* The name must match exactly an identifier used to declare an enum in this type (extraneous whitespace characters
* are not permitted).
*
* @return static
* @throws IllegalArgumentException if the enum has no constant with the specified name
*/
final public static function valueOf(string $name) : self
{
if (isset(self::$values[static::class][$name])) {
return self::$values[static::class][$name];
}
$constants = self::constants();
if (array_key_exists($name, $constants)) {
return self::createValue($name, $constants[$name][0], $constants[$name][1]);
}
throw new IllegalArgumentException(sprintf('No enum constant %s::%s', static::class, $name));
}
/**
* @return static
*/
private static function createValue(string $name, int $ordinal, array $arguments) : self
{
$instance = new static(...$arguments);
$instance->name = $name;
$instance->ordinal = $ordinal;
self::$values[static::class][$name] = $instance;
return $instance;
}
/**
* Obtains all possible types defined by this enum.
*
* @return static[]
*/
final public static function values() : array
{
if (isset(self::$allValuesLoaded[static::class])) {
return self::$values[static::class];
}
if (! isset(self::$values[static::class])) {
self::$values[static::class] = [];
}
foreach (self::constants() as $name => $constant) {
if (array_key_exists($name, self::$values[static::class])) {
continue;
}
static::createValue($name, $constant[0], $constant[1]);
}
uasort(self::$values[static::class], function (self $a, self $b) {
return $a->ordinal() <=> $b->ordinal();
});
self::$allValuesLoaded[static::class] = true;
return self::$values[static::class];
}
private static function constants() : array
{
if (isset(self::$constants[static::class])) {
return self::$constants[static::class];
}
self::$constants[static::class] = [];
$reflectionClass = new ReflectionClass(static::class);
$ordinal = -1;
foreach ($reflectionClass->getReflectionConstants() as $reflectionConstant) {
if (! $reflectionConstant->isProtected()) {
continue;
}
$value = $reflectionConstant->getValue();
self::$constants[static::class][$reflectionConstant->name] = [
++$ordinal,
is_array($value) ? $value : []
];
}
return self::$constants[static::class];
}
/**
* Returns the name of this enum constant, exactly as declared in its enum declaration.
*
* Most programmers should use the {@see self::__toString()} method in preference to this one, as the toString
* method may return a more user-friendly name. This method is designed primarily for use in specialized situations
* where correctness depends on getting the exact name, which will not vary from release to release.
*/
final public function name() : string
{
return $this->name;
}
/**
* Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial
* constant is assigned an ordinal of zero).
*
* Most programmers will have no use for this method. It is designed for use by sophisticated enum-based data
* structures.
*/
final public function ordinal() : int
{
return $this->ordinal;
}
/**
* Compares this enum with the specified object for order.
*
* Returns negative integer, zero or positive integer as this object is less than, equal to or greater than the
* specified object.
*
* Enums are only comparable to other enums of the same type. The natural order implemented by this method is the
* order in which the constants are declared.
*
* @throws MismatchException if the passed enum is not of the same type
*/
final public function compareTo(self $other) : int
{
if (! $other instanceof static) {
throw new MismatchException(sprintf(
'The passed enum %s is not of the same type as %s',
get_class($other),
static::class
));
}
return $this->ordinal - $other->ordinal;
}
/**
* Forbid cloning enums.
*
* @throws CloneNotSupportedException
*/
final public function __clone()
{
throw new CloneNotSupportedException();
}
/**
* Forbid serializing enums.
*
* @throws SerializeNotSupportedException
*/
final public function __sleep() : array
{
throw new SerializeNotSupportedException();
}
/**
* Forbid unserializing enums.
*
* @throws UnserializeNotSupportedException
*/
final public function __wakeup() : void
{
throw new UnserializeNotSupportedException();
}
/**
* Turns the enum into a string representation.
*
* You may override this method to give a more user-friendly version.
*/
public function __toString() : string
{
return $this->name;
}
}
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