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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg\Text; |
| 6 | |
| 7 | use Phpdftk\Svg\Element; |
| 8 | |
| 9 | /** |
| 10 | * Shared base for elements that carry SVG 2 §11.6 text positioning |
| 11 | * attributes (`<text>` and `<tspan>`). Each of `x`, `y`, `dx`, `dy`, and |
| 12 | * `rotate` accepts a list of numbers — one value per glyph — so the |
| 13 | * accessors return a `list<float>` even when the attribute is a single |
| 14 | * number. An absent attribute → empty list. |
| 15 | * |
| 16 | * `textLength` and `lengthAdjust` round out the v1 subset; SVG 2's |
| 17 | * `<textPath>` is deliberately out of scope (the parser falls back to |
| 18 | * `GenericElement`). |
| 19 | */ |
| 20 | abstract class TextPositioningElement extends Element |
| 21 | { |
| 22 | /** @return list<float> */ |
| 23 | public function x(): array |
| 24 | { |
| 25 | return self::parseNumberList($this->attributes['x'] ?? null); |
| 26 | } |
| 27 | |
| 28 | /** @return list<float> */ |
| 29 | public function y(): array |
| 30 | { |
| 31 | return self::parseNumberList($this->attributes['y'] ?? null); |
| 32 | } |
| 33 | |
| 34 | /** @return list<float> */ |
| 35 | public function dx(): array |
| 36 | { |
| 37 | return self::parseNumberList($this->attributes['dx'] ?? null); |
| 38 | } |
| 39 | |
| 40 | /** @return list<float> */ |
| 41 | public function dy(): array |
| 42 | { |
| 43 | return self::parseNumberList($this->attributes['dy'] ?? null); |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Per-glyph rotation in degrees (SVG 2 §11.6). One value applies to all |
| 48 | * subsequent glyphs; multiple values apply per-glyph, last value |
| 49 | * persisting for trailing glyphs. |
| 50 | * |
| 51 | * @return list<float> |
| 52 | */ |
| 53 | public function rotate(): array |
| 54 | { |
| 55 | return self::parseNumberList($this->attributes['rotate'] ?? null); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * `textLength` — the user-space length the text should occupy. SVG 2 |
| 60 | * §11.7. Null when absent; values are non-negative lengths. |
| 61 | */ |
| 62 | public function textLength(): ?float |
| 63 | { |
| 64 | $raw = $this->attributes['textLength'] ?? null; |
| 65 | if ($raw === null) { |
| 66 | return null; |
| 67 | } |
| 68 | if (preg_match('/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)/', $raw, $m) !== 1) { |
| 69 | return null; |
| 70 | } |
| 71 | $value = (float) $m[1]; |
| 72 | return $value < 0.0 ? null : $value; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * `lengthAdjust` — `spacing` (default) stretches inter-glyph gaps; |
| 77 | * `spacingAndGlyphs` also stretches each glyph. SVG 2 §11.7. |
| 78 | */ |
| 79 | public function lengthAdjust(): ?string |
| 80 | { |
| 81 | $raw = $this->attributes['lengthAdjust'] ?? null; |
| 82 | if ($raw === null) { |
| 83 | return null; |
| 84 | } |
| 85 | $value = trim($raw); |
| 86 | return match ($value) { |
| 87 | 'spacing', 'spacingAndGlyphs' => $value, |
| 88 | default => null, |
| 89 | }; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @return list<float> |
| 94 | */ |
| 95 | private static function parseNumberList(?string $raw): array |
| 96 | { |
| 97 | if ($raw === null || trim($raw) === '') { |
| 98 | return []; |
| 99 | } |
| 100 | if (preg_match_all('/[+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?/', $raw, $m) === false) { |
| 101 | return []; |
| 102 | } |
| 103 | return array_values(array_map(static fn(string $v): float => (float) $v, $m[0])); |
| 104 | } |
| 105 | } |