NumericArgumentValidator.php

<?php

namespace Drupal\views\Plugin\views\argument_validator;

use Drupal\Core\Plugin\Context\ContextDefinition;

/**
 * Validate whether an argument is numeric or not.
 *
 * @ingroup views_argument_validate_plugins
 *
 * @ViewsArgumentValidator(
 *   id = "numeric",
 *   title = @Translation("Numeric")
 * )
 */
class NumericArgumentValidator extends ArgumentValidatorPluginBase {
    public function validateArgument($argument) {
        return is_numeric($argument);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getContextDefinition() {
        return new ContextDefinition('integer', $this->argument
            ->adminLabel(), FALSE);
    }

}