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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Core\Document; |
| 6 | |
| 7 | use Phpdftk\Pdf\Core\PdfDictionary; |
| 8 | use Phpdftk\Pdf\Core\PdfName; |
| 9 | use Phpdftk\Pdf\Core\PdfNumber; |
| 10 | use Phpdftk\Pdf\Core\PdfObject; |
| 11 | use Phpdftk\Pdf\Core\PdfString; |
| 12 | use Phpdftk\Pdf\Core\PdfVersion; |
| 13 | use Phpdftk\Pdf\Core\RequiresPdfVersion; |
| 14 | |
| 15 | /** |
| 16 | * PDF Page Label dictionary (/Type /PageLabel). |
| 17 | * |
| 18 | * Defines the numbering scheme for a range of pages. |
| 19 | * Page label ranges are stored as a number tree in /PageLabels in the Catalog; |
| 20 | * each key is the zero-based page index where the range begins. |
| 21 | * |
| 22 | * Numbering styles (/S): |
| 23 | * D - Decimal Arabic numerals (1, 2, 3, …) |
| 24 | * r - Lowercase Roman numerals (i, ii, iii, …) |
| 25 | * R - Uppercase Roman numerals (I, II, III, …) |
| 26 | * a - Lowercase letters (a, b, …, z, aa, …) |
| 27 | * A - Uppercase letters (A, B, …, Z, AA, …) |
| 28 | * (omit /S to use prefix only, with no numeric part) |
| 29 | */ |
| 30 | #[RequiresPdfVersion(PdfVersion::V1_3)] |
| 31 | class PageLabel extends PdfObject |
| 32 | { |
| 33 | public const PDF_TYPE = 'PageLabel'; |
| 34 | |
| 35 | public ?PdfName $s = null; // /S - numbering style |
| 36 | public ?PdfString $p = null; // /P - label prefix |
| 37 | public int $st = 1; // /St - starting value (default 1) |
| 38 | |
| 39 | public function toPdf(): string |
| 40 | { |
| 41 | $dict = new PdfDictionary(); |
| 42 | $dict->set('Type', new PdfName(self::PDF_TYPE)); |
| 43 | |
| 44 | if ($this->s !== null) { |
| 45 | $dict->set('S', $this->s); |
| 46 | } |
| 47 | if ($this->p !== null) { |
| 48 | $dict->set('P', $this->p); |
| 49 | } |
| 50 | if ($this->st !== 1) { |
| 51 | $dict->set('St', new PdfNumber($this->st)); |
| 52 | } |
| 53 | |
| 54 | return $dict->toPdf(); |
| 55 | } |
| 56 | } |