IssnValidator.php in Plug 7

Namespace

Symfony\Component\Validator\Constraints

File

lib/Symfony/validator/Symfony/Component/Validator/Constraints/IssnValidator.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

/**
 * Validates whether the value is a valid ISSN.
 *
 * @author Antonio J. García Lagar <[e-mail]>
 * @author Bernhard Schussek <[e-mail]>
 *
 * @see https://en.wikipedia.org/wiki/Issn
 */
class IssnValidator extends ConstraintValidator {

  /**
   * {@inheritdoc}
   */
  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();
    }
  }

}

Classes

Name	Description
IssnValidator	Validates whether the value is a valid ISSN.