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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Html; |
| 6 | |
| 7 | use Phpdftk\Html\Dom\Comment; |
| 8 | use Phpdftk\Html\Dom\Document; |
| 9 | use Phpdftk\Html\Dom\DocumentFragment; |
| 10 | use Phpdftk\Html\Dom\DocumentType; |
| 11 | use Phpdftk\Html\Dom\Element; |
| 12 | use Phpdftk\Html\Dom\HTMLTemplateElement; |
| 13 | use Phpdftk\Html\Dom\Node; |
| 14 | use Phpdftk\Html\Dom\ShadowRoot; |
| 15 | use Phpdftk\Html\Dom\Text; |
| 16 | |
| 17 | /** |
| 18 | * HTML5 fragment serializer per WHATWG §13.3. Re-emits a DOM as conformant |
| 19 | * HTML5 text; serialize→parse round-trips for any DOM the parser produced. |
| 20 | * |
| 21 | * Per Q11/contract: shadow roots marked serializable=true are emitted as |
| 22 | * <template shadowrootmode="open|closed">…</template>; otherwise omitted |
| 23 | * (the host element appears without its shadow content). |
| 24 | * |
| 25 | * Phase 1B.1 ships the structural traversal; the full character-escape |
| 26 | * tables (the named-entity reverse map plus the void-element and raw-text |
| 27 | * element registries) land alongside the tokenizer in Phase 1B.2. |
| 28 | */ |
| 29 | final class Serializer |
| 30 | { |
| 31 | /** HTML void elements — emit as <foo> with no closing tag. */ |
| 32 | private const array VOID_ELEMENTS = [ |
| 33 | 'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', |
| 34 | 'link', 'meta', 'source', 'track', 'wbr', |
| 35 | ]; |
| 36 | |
| 37 | /** Raw-text elements — children are serialised verbatim (no escaping). */ |
| 38 | private const array RAW_TEXT_ELEMENTS = [ |
| 39 | 'script', 'style', 'xmp', 'iframe', 'noembed', 'noframes', 'plaintext', 'noscript', |
| 40 | ]; |
| 41 | |
| 42 | public function serialize(Node $node): string |
| 43 | { |
| 44 | return $this->serializeNode($node, parentRawText: false); |
| 45 | } |
| 46 | |
| 47 | private function serializeNode(Node $node, bool $parentRawText): string |
| 48 | { |
| 49 | return match (true) { |
| 50 | $node instanceof Document, $node instanceof DocumentFragment |
| 51 | => $this->serializeChildren($node, $parentRawText), |
| 52 | $node instanceof DocumentType => sprintf('<!DOCTYPE %s>', $node->name), |
| 53 | $node instanceof Text => $parentRawText ? $node->data : $this->escapeText($node->data), |
| 54 | $node instanceof Comment => '<!--' . $node->data . '-->', |
| 55 | $node instanceof Element => $this->serializeElement($node), |
| 56 | default => '', |
| 57 | }; |
| 58 | } |
| 59 | |
| 60 | private function serializeElement(Element $el): string |
| 61 | { |
| 62 | $tag = $el->localName; |
| 63 | $out = '<' . $tag; |
| 64 | foreach ($el->attributes() as $attr) { |
| 65 | $out .= ' ' . $attr->qualifiedName() . '="' . $this->escapeAttribute($attr->value) . '"'; |
| 66 | } |
| 67 | if (in_array($tag, self::VOID_ELEMENTS, true)) { |
| 68 | return $out . '>'; |
| 69 | } |
| 70 | $out .= '>'; |
| 71 | |
| 72 | $rawText = in_array($tag, self::RAW_TEXT_ELEMENTS, true); |
| 73 | |
| 74 | // Per HTML §13.3: if the element has a serializable shadow root, |
| 75 | // emit it first as <template shadowrootmode>…</template>. |
| 76 | $shadow = $el->shadowRoot; |
| 77 | if ($shadow !== null && $shadow->serializable) { |
| 78 | $out .= sprintf( |
| 79 | '<template shadowrootmode="%s"%s%s shadowrootserializable="">', |
| 80 | $shadow->mode->name === 'Open' ? 'open' : 'closed', |
| 81 | $shadow->delegatesFocus ? ' shadowrootdelegatesfocus=""' : '', |
| 82 | $shadow->clonable ? ' shadowrootclonable=""' : '', |
| 83 | ); |
| 84 | $out .= $this->serializeChildren($shadow, parentRawText: false); |
| 85 | $out .= '</template>'; |
| 86 | } |
| 87 | |
| 88 | // <template> children live in its `content` fragment, not directly. |
| 89 | if ($el instanceof HTMLTemplateElement && $el->content !== null) { |
| 90 | $out .= $this->serializeChildren($el->content, $rawText); |
| 91 | } else { |
| 92 | $out .= $this->serializeChildren($el, $rawText); |
| 93 | } |
| 94 | $out .= '</' . $tag . '>'; |
| 95 | return $out; |
| 96 | } |
| 97 | |
| 98 | private function serializeChildren(Node $node, bool $parentRawText): string |
| 99 | { |
| 100 | $out = ''; |
| 101 | for ($n = $node->firstChild; $n !== null; $n = $n->nextSibling) { |
| 102 | $out .= $this->serializeNode($n, $parentRawText); |
| 103 | } |
| 104 | return $out; |
| 105 | } |
| 106 | |
| 107 | private function escapeText(string $value): string |
| 108 | { |
| 109 | return strtr($value, [ |
| 110 | '&' => '&', |
| 111 | '<' => '<', |
| 112 | '>' => '>', |
| 113 | "\u{00A0}" => ' ', |
| 114 | ]); |
| 115 | } |
| 116 | |
| 117 | private function escapeAttribute(string $value): string |
| 118 | { |
| 119 | return strtr($value, [ |
| 120 | '&' => '&', |
| 121 | '"' => '"', |
| 122 | "\u{00A0}" => ' ', |
| 123 | ]); |
| 124 | } |
| 125 | } |