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Editing: ValidationBuilder.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Config\Definition\Builder;

/**
 * This class builds validation conditions.
 *
 * @author Christophe Coevoet <stof@notk.org>
 */
class ValidationBuilder
{
    protected $node;
    public $rules = array();

/**
     * Constructor
     *
     * @param NodeDefinition $node The related node
     */
    public function __construct(NodeDefinition $node)
    {
        $this->node = $node;
    }

/**
     * Registers a closure to run as normalization or an expression builder to build it if null is provided.
     *
     * @param \Closure $closure
     *
     * @return ExprBuilder|ValidationBuilder
     */
    public function rule(\Closure $closure = null)
    {
        if (null !== $closure) {
            $this->rules[] = $closure;

return $this;
        }

return $this->rules[] = new ExprBuilder($this->node);
    }
}

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