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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;
/**
* Class ElementXRef
*/
class ElementXRef extends Element
{
public function getId(): string
{
return $this->getContent();
}
public function getObject()
{
return $this->document->getObjectById($this->getId());
}
public function equals($value): bool
{
/**
* In case $value is a number and $this->value is a string like 5_0
*
* Without this if-clause code like:
*
* $element = new ElementXRef('5_0');
* $this->assertTrue($element->equals(5));
*
* would fail (= 5_0 and 5 are not equal in PHP 8.0+).
*/
if (
true === is_numeric($value)
&& true === \is_string($this->getContent())
&& 1 === preg_match('/[0-9]+\_[0-9]+/', $this->getContent(), $matches)
) {
return (float) $this->getContent() == $value;
}
$id = ($value instanceof self) ? $value->getId() : $value;
return $this->getId() == $id;
}
public function __toString(): string
{
return '#Obj#'.$this->getId();
}
/**
* @return bool|ElementXRef
*/
public static function parse(string $content, ?Document $document = null, int &$offset = 0)
{
if (preg_match('/^\s*(?P<id>[0-9]+\s+[0-9]+\s+R)/s', $content, $match)) {
$id = $match['id'];
$offset += strpos($content, $id) + \strlen($id);
$id = str_replace(' ', '_', rtrim($id, ' R'));
return new self($id, $document);
}
return false;
}
}
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