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Editing: UnaryNode.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\ExpressionLanguage\Node;

use Symfony\Component\ExpressionLanguage\Compiler;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @internal
 */
class UnaryNode extends Node
{
    private const OPERATORS = [
        '!' => '!',
        'not' => '!',
        '+' => '+',
        '-' => '-',
    ];

public function __construct(string $operator, Node $node)
    {
        parent::__construct(
            ['node' => $node],
            ['operator' => $operator]
        );
    }

public function compile(Compiler $compiler)
    {
        $compiler
            ->raw('(')
            ->raw(self::OPERATORS[$this->attributes['operator']])
            ->compile($this->nodes['node'])
            ->raw(')')
        ;
    }

public function evaluate(array $functions, array $values)
    {
        $value = $this->nodes['node']->evaluate($functions, $values);
        switch ($this->attributes['operator']) {
            case 'not':
            case '!':
                return !$value;
            case '-':
                return -$value;
        }

return $value;
    }

public function toArray(): array
    {
        return ['(', $this->attributes['operator'].' ', $this->nodes['node'], ')'];
    }
}

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