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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css\Value; |
| 6 | |
| 7 | /** |
| 8 | * CSS Generated Content for Paged Media 3 §4.2 — `element(<name> |
| 9 | * [, <fetch-target>]?)`. Emits a copy of a "running element" |
| 10 | * (one positioned via `position: running(name)`) inside a page |
| 11 | * margin box. Companion to the §5 `string()` function for the |
| 12 | * print-PDF running-header pattern, but carries arbitrary |
| 13 | * element content rather than a flat text string. |
| 14 | * |
| 15 | * header { position: running(page-header); } |
| 16 | * @page { @top-center { content: element(page-header); } } |
| 17 | * |
| 18 | * Fetch targets match §5.2: |
| 19 | * |
| 20 | * - first — first running entry on this page (default). |
| 21 | * - start — value at page start (last entry from |
| 22 | * earlier pages, or empty). |
| 23 | * - last — last entry on this page. |
| 24 | * - first-except — like first but empty if the entry begins |
| 25 | * on this page. |
| 26 | */ |
| 27 | final readonly class ElementFunction extends Value |
| 28 | { |
| 29 | public function __construct( |
| 30 | public string $name, |
| 31 | public string $target = 'first', |
| 32 | ) {} |
| 33 | |
| 34 | public function toCss(): string |
| 35 | { |
| 36 | return $this->target === 'first' |
| 37 | ? sprintf('element(%s)', $this->name) |
| 38 | : sprintf('element(%s, %s)', $this->name, $this->target); |
| 39 | } |
| 40 | } |