public function IssnValidator::validate in Plug 7

Checks if the passed value is valid.

@api

Parameters

mixed $value The value that should be validated:

Constraint $constraint The constraint for the validation:

Overrides ConstraintValidatorInterface::validate

File

lib/Symfony/validator/Symfony/Component/Validator/Constraints/IssnValidator.php, line 31

Class

IssnValidator

Validates whether the value is a valid ISSN.

Namespace

Symfony\Component\Validator\Constraints

Code

public function validate($value, Constraint $constraint) {
  if (!$constraint instanceof Issn) {
    throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\\Issn');
  }
  if (null === $value || '' === $value) {
    return;
  }
  if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
    throw new UnexpectedTypeException($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) {
    $this
      ->buildViolation($constraint->message)
      ->setParameter('{{ value }}', $this
      ->formatValue($value))
      ->setCode(Issn::MISSING_HYPHEN_ERROR)
      ->addViolation();
    return;
  }
  $length = strlen($canonical);
  if ($length < 8) {
    $this
      ->buildViolation($constraint->message)
      ->setParameter('{{ value }}', $this
      ->formatValue($value))
      ->setCode(Issn::TOO_SHORT_ERROR)
      ->addViolation();
    return;
  }
  if ($length > 8) {
    $this
      ->buildViolation($constraint->message)
      ->setParameter('{{ value }}', $this
      ->formatValue($value))
      ->setCode(Issn::TOO_LONG_ERROR)
      ->addViolation();
    return;
  }

  // 1234567X
  // ^^^^^^^ digits only
  if (!ctype_digit(substr($canonical, 0, 7))) {
    $this
      ->buildViolation($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]) {
    $this
      ->buildViolation($constraint->message)
      ->setParameter('{{ value }}', $this
      ->formatValue($value))
      ->setCode(Issn::INVALID_CHARACTERS_ERROR)
      ->addViolation();
    return;
  }

  // 1234567X
  //        ^ case-sensitive?
  if ($constraint->caseSensitive && 'x' === $canonical[7]) {
    $this
      ->buildViolation($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) * $canonical[$i];
  }
  if (0 !== $checkSum % 11) {
    $this
      ->buildViolation($constraint->message)
      ->setParameter('{{ value }}', $this
      ->formatValue($value))
      ->setCode(Issn::CHECKSUM_FAILED_ERROR)
      ->addViolation();
  }
}