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<?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;
use Smalot\PdfParser\Header;
/**
* Class ElementStruct
*/
class ElementStruct extends Element
{
/**
* @return false|Header
*/
public static function parse(string $content, ?Document $document = null, int &$offset = 0)
{
if (preg_match('/^\s*<<(?P<struct>.*)/is', $content)) {
preg_match_all('/(.*?)(<<|>>)/s', trim($content), $matches);
$level = 0;
$sub = '';
foreach ($matches[0] as $part) {
$sub .= $part;
$level += (false !== strpos($part, '<<') ? 1 : -1);
if ($level <= 0) {
break;
}
}
$offset += strpos($content, '<<') + \strlen(rtrim($sub));
// Removes '<<' and '>>'.
$sub = trim((string) preg_replace('/^\s*<<(.*)>>\s*$/s', '\\1', $sub));
$position = 0;
$elements = Element::parse($sub, $document, $position);
return new Header($elements, $document);
}
return false;
}
}
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