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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\HtmlToPdf\Svg; |
| 6 | |
| 7 | use Phpdftk\Html\Dom\Element as HtmlElement; |
| 8 | use Phpdftk\HtmlToPdf\ForeignContent\DomXmlSerializer; |
| 9 | use Phpdftk\Svg\Parser as SvgParser; |
| 10 | use Phpdftk\Svg\SvgDocument; |
| 11 | |
| 12 | /** |
| 13 | * Convert an inline-SVG subtree from the HTML DOM into a typed |
| 14 | * {@see SvgDocument} so the existing SVG renderer can paint it. |
| 15 | * |
| 16 | * Routes through {@see DomXmlSerializer} for the HTML-DOM-to-XML |
| 17 | * walk + namespace plumbing, then hands the XML to the SVG parser. |
| 18 | * The adapter's own responsibility is: |
| 19 | * |
| 20 | * - Reject elements that aren't an `<svg>` in `SVG_NS`. |
| 21 | * - Cache parsed documents by element identity so the same |
| 22 | * `<svg>` painted on N pages only pays the parse cost once. |
| 23 | * |
| 24 | * The cache uses `===` identity, not equality — two distinct `<svg>` |
| 25 | * elements with byte-identical markup get parsed once each. |
| 26 | */ |
| 27 | final class InlineSvgAdapter |
| 28 | { |
| 29 | /** @var \SplObjectStorage<HtmlElement, SvgDocument> */ |
| 30 | private \SplObjectStorage $cache; |
| 31 | |
| 32 | public function __construct( |
| 33 | private readonly SvgParser $parser = new SvgParser(), |
| 34 | private readonly DomXmlSerializer $serializer = new DomXmlSerializer(), |
| 35 | ) { |
| 36 | $this->cache = new \SplObjectStorage(); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Adapt an HTML DOM `<svg>` element into a typed SvgDocument. |
| 41 | * |
| 42 | * @throws \InvalidArgumentException When the element isn't an |
| 43 | * `<svg>` in the SVG namespace. |
| 44 | */ |
| 45 | public function adapt(HtmlElement $element): SvgDocument |
| 46 | { |
| 47 | // Accept both `<svg>` in the SVG namespace and the prefixed XHTML |
| 48 | // form `<svg:svg>` (left as a plain HTML element by the HTML |
| 49 | // parser). The serializer below re-namespaces the subtree before |
| 50 | // the SVG parser sees it. |
| 51 | $tag = strtolower($element->localName); |
| 52 | $colon = strrpos($tag, ':'); |
| 53 | $local = $colon !== false ? substr($tag, $colon + 1) : $tag; |
| 54 | $isSvgNs = $element->namespaceUri() === SvgParser::SVG_NS; |
| 55 | if ($local !== 'svg' || (!$isSvgNs && $colon === false)) { |
| 56 | throw new \InvalidArgumentException(sprintf( |
| 57 | 'InlineSvgAdapter expects an <svg> element in the SVG namespace ' |
| 58 | . '(or the prefixed <svg:svg> form), got <%s> in namespace %s.', |
| 59 | $element->localName, |
| 60 | $element->namespaceUri() ?? '(null)', |
| 61 | )); |
| 62 | } |
| 63 | if ($this->cache->contains($element)) { |
| 64 | return $this->cache[$element]; |
| 65 | } |
| 66 | $xml = $this->serializer->serialize($element, SvgParser::SVG_NS); |
| 67 | $svg = $this->parser->parse($xml); |
| 68 | $this->cache[$element] = $svg; |
| 69 | return $svg; |
| 70 | } |
| 71 | } |