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Editing: BaseString.php

<?php

declare(strict_types=1);

namespace SpomkyLabs\Pki\ASN1\Type;

use InvalidArgumentException;
use SpomkyLabs\Pki\ASN1\Element;
use Stringable;

/**
 * Base class for all string types.
 */
abstract class BaseString extends Element implements StringType, Stringable
{
    /**
     * String value.
     */
    private readonly string $string;

protected function __construct(int $typeTag, string $string)
    {
        parent::__construct($typeTag);
        if (! $this->validateString($string)) {
            throw new InvalidArgumentException(sprintf('Not a valid %s string.', self::tagToName($this->typeTag)));
        }
        $this->string = $string;
    }

public function __toString(): string
    {
        return $this->string();
    }

/**
     * Get the string value.
     */
    public function string(): string
    {
        return $this->string;
    }

protected function encodedAsDER(): string
    {
        return $this->string;
    }

/**
     * Check whether string is valid for the concrete type.
     */
    protected function validateString(string $string): bool
    {
        // Override in derived classes
        return true;
    }
}

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