TypeHelper.php

<?php

declare (strict_types=1);
namespace SlevomatCodingStandard\Helpers;

use Exception;
use function preg_last_error;
use function preg_match;

/**
 * @internal
 */
class TypeHelper {
    
    /**
     * Validates type name according to the allowed characters in type names + namespaces
     *
     * @link http://php.net/manual/en/language.oop5.basic.php
     */
    public static function isTypeName(string $typeName) : bool {
        $result = preg_match('~^\\\\?([a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*)(\\\\[a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*)*$~', $typeName);
        if ($result === false) {
            // @codeCoverageIgnoreStart
            throw new Exception('PREG error ' . preg_last_error());
            // @codeCoverageIgnoreEnd
        }
        return $result !== 0;
    }

}