RangeConstraintValidator.php

<?php

namespace Drupal\Core\Validation\Plugin\Validation\Constraint;

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

/**
 * Validator for the Drupal 'range' constraint.
 */
class RangeConstraintValidator extends ConstraintValidator {
    
    /**
     * {@inheritdoc}
     */
    public function validate($value, Constraint $constraint) : void {
        if (!$constraint instanceof Range) {
            throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\\Range');
        }
        if (NULL === $value) {
            return;
        }
        if (!is_numeric($value) && !$value instanceof \DateTimeInterface) {
            $this->context
                ->buildViolation($constraint->invalidMessage)
                ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
                ->setCode(Range::INVALID_CHARACTERS_ERROR)
                ->addViolation();
            return;
        }
        $min = $constraint->min;
        $max = $constraint->max;
        // Convert strings to DateTimes if comparing another DateTime.
        // This allows to compare with any date/time value supported by
        // the DateTime constructor.
        // @see http://php.net/manual/en/datetime.formats.php
        if ($value instanceof \DateTimeInterface) {
            if (\is_string($min)) {
                $min = new \DateTime($min);
            }
            if (\is_string($max)) {
                $max = new \DateTime($max);
            }
        }
        $hasLowerLimit = NULL !== $constraint->min;
        $hasUpperLimit = NULL !== $constraint->max;
        if ($hasLowerLimit && $hasUpperLimit && ($value < $min || $value > $max)) {
            $this->context
                ->buildViolation($constraint->notInRangeMessage)
                ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
                ->setParameter('{{ min }}', $this->formatValue($min, self::PRETTY_DATE))
                ->setParameter('{{ max }}', $this->formatValue($max, self::PRETTY_DATE))
                ->setCode(Range::NOT_IN_RANGE_ERROR)
                ->addViolation();
            return;
        }
        if ($hasUpperLimit && $value > $max) {
            $this->context
                ->buildViolation($constraint->maxMessage)
                ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
                ->setParameter('{{ limit }}', $this->formatValue($max, self::PRETTY_DATE))
                ->setCode(Range::TOO_HIGH_ERROR)
                ->addViolation();
            return;
        }
        if ($hasLowerLimit && $value < $min) {
            $this->context
                ->buildViolation($constraint->minMessage)
                ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
                ->setParameter('{{ limit }}', $this->formatValue($min, self::PRETTY_DATE))
                ->setCode(Range::TOO_LOW_ERROR)
                ->addViolation();
        }
    }

}