function IssnValidator::validate

Overrides ConstraintValidatorInterface::validate

File

vendor/symfony/validator/Constraints/IssnValidator.php, line 29

Class

IssnValidator

Validates whether the value is a valid ISSN.

Namespace

Symfony\Component\Validator\Constraints

Code

public function validate(mixed $value, Constraint $constraint) : void {
    if (!$constraint instanceof Issn) {
        throw new UnexpectedTypeException($constraint, Issn::class);
    }
    if (null === $value || '' === $value) {
        return;
    }
    if (!\is_scalar($value) && !$value instanceof \Stringable) {
        throw new UnexpectedValueException($value, 'string');
    }
    $value = (string) $value;
    $canonical = $value;
    // 1234-567X
    //     ^
    if (isset($canonical[4]) && '-' === $canonical[4]) {
        // remove hyphen
        $canonical = substr($canonical, 0, 4) . substr($canonical, 5);
    }
    elseif ($constraint->requireHyphen) {
        $this->context
            ->buildViolation($constraint->message)
            ->setParameter('{{ value }}', $this->formatValue($value))
            ->setCode(Issn::MISSING_HYPHEN_ERROR)
            ->addViolation();
        return;
    }
    $length = \strlen($canonical);
    if ($length < 8) {
        $this->context
            ->buildViolation($constraint->message)
            ->setParameter('{{ value }}', $this->formatValue($value))
            ->setCode(Issn::TOO_SHORT_ERROR)
            ->addViolation();
        return;
    }
    if ($length > 8) {
        $this->context
            ->buildViolation($constraint->message)
            ->setParameter('{{ value }}', $this->formatValue($value))
            ->setCode(Issn::TOO_LONG_ERROR)
            ->addViolation();
        return;
    }
    // 1234567X
    // ^^^^^^^ digits only
    if (!ctype_digit(substr($canonical, 0, 7))) {
        $this->context
            ->buildViolation($constraint->message)
            ->setParameter('{{ value }}', $this->formatValue($value))
            ->setCode(Issn::INVALID_CHARACTERS_ERROR)
            ->addViolation();
        return;
    }
    // 1234567X
    //        ^ digit, x or X
    if (!ctype_digit($canonical[7]) && 'x' !== $canonical[7] && 'X' !== $canonical[7]) {
        $this->context
            ->buildViolation($constraint->message)
            ->setParameter('{{ value }}', $this->formatValue($value))
            ->setCode(Issn::INVALID_CHARACTERS_ERROR)
            ->addViolation();
        return;
    }
    // 1234567X
    //        ^ case-sensitive?
    if ($constraint->caseSensitive && 'x' === $canonical[7]) {
        $this->context
            ->buildViolation($constraint->message)
            ->setParameter('{{ value }}', $this->formatValue($value))
            ->setCode(Issn::INVALID_CASE_ERROR)
            ->addViolation();
        return;
    }
    // Calculate a checksum. "X" equals 10.
    $checkSum = 'X' === $canonical[7] || 'x' === $canonical[7] ? 10 : $canonical[7];
    for ($i = 0; $i < 7; ++$i) {
        // Multiply the first digit by 8, the second by 7, etc.
        $checkSum += (8 - $i) * (int) $canonical[$i];
    }
    if (0 !== $checkSum % 11) {
        $this->context
            ->buildViolation($constraint->message)
            ->setParameter('{{ value }}', $this->formatValue($value))
            ->setCode(Issn::CHECKSUM_FAILED_ERROR)
            ->addViolation();
    }
}