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<?php |
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|
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declare(strict_types=1); |
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|
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namespace WP\McpSchema\Common; |
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|
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/** |
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* Base class for PHP 7.4 enum emulation. |
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* |
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* @mcp-version 2025-11-25 |
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*/ |
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abstract class AbstractEnum |
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{ |
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/** @var string */ |
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private string $value; |
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|
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/** @var array<string, static> */ |
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private static array $instances = []; |
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|
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/** |
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* @param string $value |
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*/ |
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private function __construct(string $value) |
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{ |
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$this->value = $value; |
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} |
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|
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/** |
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* Creates an instance from a value. |
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* |
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* @param string $value |
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* @return static |
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* @throws \InvalidArgumentException |
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*/ |
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public static function from(string $value): self |
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{ |
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$values = static::values(); |
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if (!in_array($value, $values, true)) { |
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throw new \InvalidArgumentException( |
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sprintf('Invalid enum value: %s. Valid values: %s', $value, implode(', ', $values)) |
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); |
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} |
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|
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$key = static::class . '::' . $value; |
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if (!isset(self::$instances[$key])) { |
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/** @phpstan-ignore new.static (Intentional: private constructor prevents subclass override) */ |
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self::$instances[$key] = new static($value); |
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} |
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|
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return self::$instances[$key]; |
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} |
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|
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/** |
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* Creates an instance from a value, or null if invalid. |
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* |
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* @param string $value |
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* @return static|null |
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*/ |
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public static function tryFrom(string $value): ?self |
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{ |
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try { |
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return static::from($value); |
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} catch (\InvalidArgumentException $e) { |
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return null; |
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} |
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} |
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|
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/** |
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* Returns all valid values for this enum. |
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* |
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* @return string[] |
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*/ |
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abstract public static function values(): array; |
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|
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/** |
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* Returns all cases as instances. |
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* |
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* @return static[] |
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*/ |
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public static function cases(): array |
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{ |
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return array_map(fn(string $value) => static::from($value), static::values()); |
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} |
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|
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/** |
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* Gets the enum value. |
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* |
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* @return string |
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*/ |
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public function getValue(): string |
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{ |
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return $this->value; |
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} |
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|
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/** |
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* Converts to string. |
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* |
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* @return string |
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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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/** |
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* Compares with another instance. |
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* |
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* @param self $other |
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* @return bool |
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*/ |
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public function equals(self $other): bool |
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{ |
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return $this->value === $other->value && static::class === get_class($other); |
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} |
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} |
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|
