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1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Pdf\Core\Document;
6
7use Phpdftk\Pdf\Core\PdfArray;
8use Phpdftk\Pdf\Core\PdfDictionary;
9use Phpdftk\Pdf\Core\PdfName;
10use Phpdftk\Pdf\Core\PdfObject;
11use Phpdftk\Pdf\Core\PdfVersion;
12use Phpdftk\Pdf\Core\RequiresPdfVersion;
13
14/**
15 * Requirement dictionary — ISO 32000-2 §12.10, Table 253.
16 *
17 * Declares processor capabilities that a conforming reader must support
18 * to fully render the document. Referenced from `Catalog::$requirements`.
19 */
20#[RequiresPdfVersion(PdfVersion::V1_7)]
21class Requirement extends PdfObject
22{
23    public const PDF_TYPE = 'Requirement';
24
25    public PdfName $s;                 // /S - subtype (EnableJavaScripts, …)
26    public ?PdfArray $rh = null;       // /RH - requirement handlers
27
28    public function __construct(string $subtype)
29    {
30        $this->s = new PdfName($subtype);
31    }
32
33    public function toPdf(): string
34    {
35        $dict = new PdfDictionary();
36        $dict->set('Type', new PdfName(self::PDF_TYPE));
37        $dict->set('S', $this->s);
38        if ($this->rh !== null) {
39            $dict->set('RH', $this->rh);
40        }
41        return $dict->toPdf();
42    }
43}