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<?php |
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|
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/** |
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* @file |
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* This file is part of the PdfParser library. |
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* |
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* @author Sébastien MALOT <sebastien@malot.fr> |
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* |
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* @date 2017-01-03 |
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* |
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* @license LGPLv3 |
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* |
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* @url <https://github.com/smalot/pdfparser> |
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* |
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* PdfParser is a pdf library written in PHP, extraction oriented. |
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* Copyright (C) 2017 - Sébastien MALOT <sebastien@malot.fr> |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. |
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* If not, see <http://www.pdfparser.org/sites/default/LICENSE.txt>. |
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*/ |
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|
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namespace Smalot\PdfParser\Element; |
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|
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use Smalot\PdfParser\Document; |
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use Smalot\PdfParser\Element; |
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use Smalot\PdfParser\Header; |
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|
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/** |
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* Class ElementStruct |
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*/ |
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class ElementStruct extends Element |
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{ |
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/** |
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* @return false|Header |
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*/ |
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public static function parse(string $content, ?Document $document = null, int &$offset = 0) |
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{ |
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if (preg_match('/^\s*<<(?P<struct>.*)/is', $content)) { |
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preg_match_all('/(.*?)(<<|>>)/s', trim($content), $matches); |
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|
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$level = 0; |
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$sub = ''; |
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foreach ($matches[0] as $part) { |
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$sub .= $part; |
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$level += (false !== strpos($part, '<<') ? 1 : -1); |
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if ($level <= 0) { |
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break; |
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} |
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} |
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|
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$offset += strpos($content, '<<') + \strlen(rtrim($sub)); |
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|
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// Removes '<<' and '>>'. |
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$sub = trim((string) preg_replace('/^\s*<<(.*)>>\s*$/s', '\\1', $sub)); |
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|
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$position = 0; |
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$elements = Element::parse($sub, $document, $position); |
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|
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return new Header($elements, $document); |
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} |
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|
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return false; |
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} |
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} |
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|
