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Editing:ElementNull.php

<?php

/**
 * @file
 *          This file is part of the PdfParser library.
 *
 * @author  Sébastien MALOT <sebastien@malot.fr>
 *
 * @date    2017-01-03
 *
 * @license LGPLv3
 *
 * @url     <https://github.com/smalot/pdfparser>
 *
 *  PdfParser is a pdf library written in PHP, extraction oriented.
 *  Copyright (C) 2017 - Sébastien MALOT <sebastien@malot.fr>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program.
 *  If not, see <http://www.pdfparser.org/sites/default/LICENSE.txt>.
 */

namespace Smalot\PdfParser\Element;

use Smalot\PdfParser\Document;
use Smalot\PdfParser\Element;

/**
 * Class ElementNull
 */
class ElementNull extends Element
{
    public function __construct()
    {
        parent::__construct(null, null);
    }

public function __toString(): string
    {
        return 'null';
    }

public function equals($value): bool
    {
        return $this->getContent() === $value;
    }

/**
     * @return bool|ElementNull
     */
    public static function parse(string $content, ?Document $document = null, int &$offset = 0)
    {
        if (preg_match('/^\s*(null)/s', $content, $match)) {
            $offset += strpos($content, 'null') + \strlen('null');

return new self();
        }

return false;
    }
}

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Editing:ElementNull.php