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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg; |
| 6 | |
| 7 | /** |
| 8 | * Shared base for SVG elements that establish a viewport — currently |
| 9 | * `<svg>` (root) and `<symbol>`. Both carry a `viewBox` and optional |
| 10 | * `width` / `height`, and both apply the viewBox-to-viewport mapping |
| 11 | * described in SVG 2 §7. The two raw width/height accessors stay |
| 12 | * `string`-typed because the spec permits unit suffixes (`%`, `em`, …) |
| 13 | * that downstream code may want to round-trip. |
| 14 | */ |
| 15 | abstract class ViewportElement extends Element |
| 16 | { |
| 17 | /** |
| 18 | * Parsed `viewBox` per SVG 2 §7.7 — `[minX, minY, width, height]`, |
| 19 | * or null if no viewBox is set. Negative width/height return null |
| 20 | * (the spec invalidates them). |
| 21 | * |
| 22 | * @return array{0: float, 1: float, 2: float, 3: float}|null |
| 23 | */ |
| 24 | public function viewBox(): ?array |
| 25 | { |
| 26 | $raw = $this->getAttribute('viewBox'); |
| 27 | if ($raw === null) { |
| 28 | return null; |
| 29 | } |
| 30 | $parts = preg_split('/[\s,]+/', trim($raw)) ?: []; |
| 31 | if (count($parts) !== 4) { |
| 32 | return null; |
| 33 | } |
| 34 | foreach ($parts as $p) { |
| 35 | if (!is_numeric($p)) { |
| 36 | return null; |
| 37 | } |
| 38 | } |
| 39 | $w = (float) $parts[2]; |
| 40 | $h = (float) $parts[3]; |
| 41 | if ($w < 0 || $h < 0) { |
| 42 | return null; |
| 43 | } |
| 44 | return [(float) $parts[0], (float) $parts[1], $w, $h]; |
| 45 | } |
| 46 | |
| 47 | /** Raw `width=""` attribute string (may include a unit), or null. */ |
| 48 | public function widthAttribute(): ?string |
| 49 | { |
| 50 | return $this->getAttribute('width'); |
| 51 | } |
| 52 | |
| 53 | /** Raw `height=""` attribute string (may include a unit), or null. */ |
| 54 | public function heightAttribute(): ?string |
| 55 | { |
| 56 | return $this->getAttribute('height'); |
| 57 | } |
| 58 | } |