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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Html; |
| 6 | |
| 7 | use Phpdftk\Html\Dom\Document; |
| 8 | use Phpdftk\Html\Dom\DocumentFragment; |
| 9 | use Phpdftk\Html\Dom\Element; |
| 10 | use Phpdftk\Html\Tokenizer\Tokenizer; |
| 11 | use Phpdftk\Html\TreeConstruction\TreeBuilder; |
| 12 | |
| 13 | /** |
| 14 | * WHATWG HTML5 parser entry point. Hand-rolls the tokenizer (§13.2.5) and |
| 15 | * tree-construction state machine (§13.2.6) — no `libxml`, no DOM extension. |
| 16 | * |
| 17 | * The public surface is intentionally tiny: parseDocument() for a full HTML |
| 18 | * document and parseFragment() for innerHTML-style operations and HTML |
| 19 | * embedded in SVG <foreignObject>. |
| 20 | * |
| 21 | * Implementation is staged across Phase 1B sub-phases: |
| 22 | * - 1B.1: public DOM types and parser shell (this file). |
| 23 | * - 1B.2: tokenizer state machine. |
| 24 | * - 1B.3: tree-construction insertion modes. |
| 25 | * - 1B.4: declarative-shadow-DOM tree-construction integration. |
| 26 | * - 1B.5: html5lib-tests integration to 100%. |
| 27 | */ |
| 28 | final class Parser |
| 29 | { |
| 30 | public function __construct(public readonly ParserOptions $options = new ParserOptions()) {} |
| 31 | |
| 32 | /** |
| 33 | * Parse a complete HTML document. |
| 34 | * |
| 35 | * @param string $html The HTML source. |
| 36 | * @param string|null $encoding Optional override for encoding sniffing. |
| 37 | */ |
| 38 | public function parseDocument(string $html, ?string $encoding = null): Document |
| 39 | { |
| 40 | $tokenizer = new Tokenizer($html); |
| 41 | $builder = new TreeBuilder($this->options); |
| 42 | $doc = $builder->build($tokenizer); |
| 43 | $this->mirrorSelectedContent($doc); |
| 44 | return $doc; |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Post-parse pass for the customizable-select `<selectedcontent>` element: |
| 49 | * mirror the selected option's children into each `<selectedcontent>` |
| 50 | * descendant of every `<select>`. Per the customizable-select draft, this |
| 51 | * happens at runtime — but parsing-time test fixtures (html5lib-tests |
| 52 | * webkit02 #45–#48) bake the mirror into their expected output, so we |
| 53 | * perform it once after the tree is built. |
| 54 | */ |
| 55 | private function mirrorSelectedContent(Document $doc): void |
| 56 | { |
| 57 | $stack = [$doc]; |
| 58 | $selects = []; |
| 59 | while ($stack !== []) { |
| 60 | $node = array_pop($stack); |
| 61 | foreach ($node->childNodes() as $child) { |
| 62 | if ($child instanceof Element) { |
| 63 | if ($child->localName === 'select' |
| 64 | && $child->namespaceURI === \Phpdftk\Html\Dom\Document::HTML_NS |
| 65 | ) { |
| 66 | $selects[] = $child; |
| 67 | } |
| 68 | $stack[] = $child; |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | foreach ($selects as $select) { |
| 73 | $selectedContent = $this->findFirstDescendant($select, 'selectedcontent'); |
| 74 | if ($selectedContent === null) { |
| 75 | continue; |
| 76 | } |
| 77 | $option = $this->findSelectedOption($select); |
| 78 | if ($option === null) { |
| 79 | continue; |
| 80 | } |
| 81 | foreach ($option->childNodes() as $child) { |
| 82 | $selectedContent->appendChild($child->cloneNode(true)); |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | private function findFirstDescendant(Element $root, string $localName): ?Element |
| 88 | { |
| 89 | $stack = [$root]; |
| 90 | while ($stack !== []) { |
| 91 | $node = array_pop($stack); |
| 92 | foreach ($node->childNodes() as $child) { |
| 93 | if ($child instanceof Element) { |
| 94 | if ($child->localName === $localName |
| 95 | && $child->namespaceURI === \Phpdftk\Html\Dom\Document::HTML_NS |
| 96 | ) { |
| 97 | return $child; |
| 98 | } |
| 99 | $stack[] = $child; |
| 100 | } |
| 101 | } |
| 102 | } |
| 103 | return null; |
| 104 | } |
| 105 | |
| 106 | private function findSelectedOption(Element $select): ?Element |
| 107 | { |
| 108 | $firstOption = null; |
| 109 | $stack = [$select]; |
| 110 | while ($stack !== []) { |
| 111 | $node = array_pop($stack); |
| 112 | foreach ($node->childNodes() as $child) { |
| 113 | if (!$child instanceof Element) { |
| 114 | continue; |
| 115 | } |
| 116 | if ($child->localName === 'option' |
| 117 | && $child->namespaceURI === \Phpdftk\Html\Dom\Document::HTML_NS |
| 118 | ) { |
| 119 | if ($child->hasAttribute('selected')) { |
| 120 | return $child; |
| 121 | } |
| 122 | $firstOption ??= $child; |
| 123 | } |
| 124 | // Don't recurse into nested selects. |
| 125 | if ($child->localName === 'select' |
| 126 | && $child->namespaceURI === \Phpdftk\Html\Dom\Document::HTML_NS |
| 127 | && $child !== $select |
| 128 | ) { |
| 129 | continue; |
| 130 | } |
| 131 | $stack[] = $child; |
| 132 | } |
| 133 | } |
| 134 | return $firstOption; |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Parse an HTML fragment in the context of a host element per WHATWG |
| 139 | * §13.4. The context element determines the initial tokenizer state |
| 140 | * (e.g. RCDATA for <title>/<textarea>, RAWTEXT for <style>/<script>, |
| 141 | * PLAINTEXT for <plaintext>) and the initial insertion mode (via the |
| 142 | * "reset insertion mode appropriately" walk with the context as the |
| 143 | * implicit bottom of the stack). |
| 144 | */ |
| 145 | public function parseFragment(string $html, Element $context): DocumentFragment |
| 146 | { |
| 147 | // Step 1: new document, inherit mode from context's owner. |
| 148 | $doc = new \Phpdftk\Html\Dom\Document(); |
| 149 | $doc->mode = $context->ownerDocument->mode; |
| 150 | |
| 151 | // Step 2: tokenizer with context-aware initial state. |
| 152 | $tokenizer = new Tokenizer($html); |
| 153 | if ($context->namespaceURI === \Phpdftk\Html\Dom\Document::HTML_NS) { |
| 154 | $tokenizer->state = match ($context->localName) { |
| 155 | 'title', 'textarea' => \Phpdftk\Html\Tokenizer\TokenizerState::Rcdata, |
| 156 | 'style', 'xmp', 'iframe', 'noembed', 'noframes' => \Phpdftk\Html\Tokenizer\TokenizerState::Rawtext, |
| 157 | 'script' => \Phpdftk\Html\Tokenizer\TokenizerState::ScriptData, |
| 158 | 'noscript' => $this->options->scriptingEnabled |
| 159 | ? \Phpdftk\Html\Tokenizer\TokenizerState::Rawtext |
| 160 | : \Phpdftk\Html\Tokenizer\TokenizerState::Data, |
| 161 | 'plaintext' => \Phpdftk\Html\Tokenizer\TokenizerState::Plaintext, |
| 162 | default => \Phpdftk\Html\Tokenizer\TokenizerState::Data, |
| 163 | }; |
| 164 | } |
| 165 | |
| 166 | // Step 3-9 delegated to TreeBuilder::buildFragment, which configures |
| 167 | // the initial state (html root, form pointer, template stack, reset |
| 168 | // insertion mode based on context) and runs the parse. |
| 169 | $builder = new TreeBuilder($this->options, $doc); |
| 170 | return $builder->buildFragment($tokenizer, $context); |
| 171 | } |
| 172 | } |