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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Html\Dom; |
| 6 | |
| 7 | /** |
| 8 | * Abstract DOM node. Concrete subclasses: Document, DocumentFragment, |
| 9 | * DocumentType, Element, Text, Comment. |
| 10 | * |
| 11 | * Mutation methods (appendChild, insertBefore, removeChild, replaceChild) |
| 12 | * maintain the parent / sibling pointer invariants. They're public — per the |
| 13 | * Q1 contract decision, post-parse mutation is a supported feature (server- |
| 14 | * side rewriting, sanitization, etc.) rather than an internal-only operation. |
| 15 | */ |
| 16 | abstract class Node |
| 17 | { |
| 18 | /** Set in constructor; never reassigned. */ |
| 19 | protected readonly ?Document $documentRef; |
| 20 | |
| 21 | public ?Node $parentNode { get => $this->parentRef; } |
| 22 | private ?Node $parentRef = null; |
| 23 | |
| 24 | public ?Node $previousSibling { get => $this->prevRef; } |
| 25 | private ?Node $prevRef = null; |
| 26 | |
| 27 | public ?Node $nextSibling { get => $this->nextRef; } |
| 28 | private ?Node $nextRef = null; |
| 29 | |
| 30 | public ?Node $firstChild { get => $this->firstRef; } |
| 31 | private ?Node $firstRef = null; |
| 32 | |
| 33 | public ?Node $lastChild { get => $this->lastRef; } |
| 34 | private ?Node $lastRef = null; |
| 35 | |
| 36 | public ?Element $parentElement { |
| 37 | get => $this->parentRef instanceof Element ? $this->parentRef : null; |
| 38 | } |
| 39 | |
| 40 | public Document $ownerDocument { |
| 41 | get => $this instanceof Document ? $this : ($this->documentRef ?? throw new \LogicException( |
| 42 | sprintf('Node of type %s has no owner document', static::class), |
| 43 | )); |
| 44 | } |
| 45 | |
| 46 | public function __construct(?Document $ownerDocument) |
| 47 | { |
| 48 | $this->documentRef = $ownerDocument; |
| 49 | } |
| 50 | |
| 51 | abstract public function nodeType(): NodeType; |
| 52 | |
| 53 | /** |
| 54 | * Per WHATWG: uppercase tag name for HTML elements, "#text", "#comment", |
| 55 | * "#document", "#document-fragment", or the doctype name. |
| 56 | */ |
| 57 | abstract public function nodeName(): string; |
| 58 | |
| 59 | /** @return list<Node> snapshot of direct children at the time of the call */ |
| 60 | public function childNodes(): array |
| 61 | { |
| 62 | $out = []; |
| 63 | for ($n = $this->firstRef; $n !== null; $n = $n->nextRef) { |
| 64 | $out[] = $n; |
| 65 | } |
| 66 | return $out; |
| 67 | } |
| 68 | |
| 69 | public function hasChildNodes(): bool |
| 70 | { |
| 71 | return $this->firstRef !== null; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Concatenation of descendant Text node data. Per WHATWG: for Document, |
| 76 | * DocumentType, Comment, ProcessingInstruction this is implementation- |
| 77 | * defined; for our purposes, Document/DocumentFragment/Element return the |
| 78 | * concatenation, Text returns its data, Comment returns its data, |
| 79 | * DocumentType returns ''. |
| 80 | */ |
| 81 | public function textContent(): string |
| 82 | { |
| 83 | $out = ''; |
| 84 | for ($n = $this->firstRef; $n !== null; $n = $n->nextRef) { |
| 85 | $out .= $n->textContent(); |
| 86 | } |
| 87 | return $out; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Replace all children with a single Text node containing $text. |
| 92 | * Empty string clears all children with no replacement. |
| 93 | */ |
| 94 | public function setTextContent(string $text): void |
| 95 | { |
| 96 | while ($this->firstRef !== null) { |
| 97 | $this->removeChild($this->firstRef); |
| 98 | } |
| 99 | if ($text !== '') { |
| 100 | $this->appendChild(new Text($this->ownerDocument, $text)); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | public function appendChild(Node $child): Node |
| 105 | { |
| 106 | return $this->insertBefore($child, null); |
| 107 | } |
| 108 | |
| 109 | public function insertBefore(Node $child, ?Node $reference): Node |
| 110 | { |
| 111 | if ($reference !== null && $reference->parentRef !== $this) { |
| 112 | throw new \InvalidArgumentException('Reference node is not a child of this parent'); |
| 113 | } |
| 114 | if ($child === $this || $child->isAncestorOf($this)) { |
| 115 | throw new \InvalidArgumentException('Cannot insert a node into one of its own descendants'); |
| 116 | } |
| 117 | |
| 118 | // Detach from previous parent if any. |
| 119 | if ($child->parentRef !== null) { |
| 120 | $child->parentRef->removeChild($child); |
| 121 | } |
| 122 | |
| 123 | $child->parentRef = $this; |
| 124 | |
| 125 | if ($reference === null) { |
| 126 | // Append. |
| 127 | $child->prevRef = $this->lastRef; |
| 128 | $child->nextRef = null; |
| 129 | if ($this->lastRef !== null) { |
| 130 | $this->lastRef->nextRef = $child; |
| 131 | } else { |
| 132 | $this->firstRef = $child; |
| 133 | } |
| 134 | $this->lastRef = $child; |
| 135 | } else { |
| 136 | // Insert before reference. |
| 137 | $child->prevRef = $reference->prevRef; |
| 138 | $child->nextRef = $reference; |
| 139 | if ($reference->prevRef !== null) { |
| 140 | $reference->prevRef->nextRef = $child; |
| 141 | } else { |
| 142 | $this->firstRef = $child; |
| 143 | } |
| 144 | $reference->prevRef = $child; |
| 145 | } |
| 146 | |
| 147 | return $child; |
| 148 | } |
| 149 | |
| 150 | public function removeChild(Node $child): Node |
| 151 | { |
| 152 | if ($child->parentRef !== $this) { |
| 153 | throw new \InvalidArgumentException('Node is not a child of this parent'); |
| 154 | } |
| 155 | if ($child->prevRef !== null) { |
| 156 | $child->prevRef->nextRef = $child->nextRef; |
| 157 | } else { |
| 158 | $this->firstRef = $child->nextRef; |
| 159 | } |
| 160 | if ($child->nextRef !== null) { |
| 161 | $child->nextRef->prevRef = $child->prevRef; |
| 162 | } else { |
| 163 | $this->lastRef = $child->prevRef; |
| 164 | } |
| 165 | $child->parentRef = null; |
| 166 | $child->prevRef = null; |
| 167 | $child->nextRef = null; |
| 168 | return $child; |
| 169 | } |
| 170 | |
| 171 | public function replaceChild(Node $newChild, Node $oldChild): Node |
| 172 | { |
| 173 | if ($oldChild->parentRef !== $this) { |
| 174 | throw new \InvalidArgumentException('Node to be replaced is not a child of this parent'); |
| 175 | } |
| 176 | $this->insertBefore($newChild, $oldChild); |
| 177 | $this->removeChild($oldChild); |
| 178 | return $oldChild; |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Deep- or shallow-clone the node. Per Q1, mutation post-parse is a |
| 183 | * feature; deep clones produce an independent subtree with no shared |
| 184 | * parent linkage. |
| 185 | */ |
| 186 | public function cloneNode(bool $deep = true): static |
| 187 | { |
| 188 | $copy = $this->shallowClone(); |
| 189 | if ($deep) { |
| 190 | for ($n = $this->firstRef; $n !== null; $n = $n->nextRef) { |
| 191 | $copy->appendChild($n->cloneNode(true)); |
| 192 | } |
| 193 | } |
| 194 | /** @var static $copy */ |
| 195 | return $copy; |
| 196 | } |
| 197 | |
| 198 | /** Subclass-specific construction of a child-less copy. */ |
| 199 | abstract protected function shallowClone(): static; |
| 200 | |
| 201 | protected function isAncestorOf(Node $other): bool |
| 202 | { |
| 203 | for ($n = $other->parentRef; $n !== null; $n = $n->parentRef) { |
| 204 | if ($n === $this) { |
| 205 | return true; |
| 206 | } |
| 207 | } |
| 208 | return false; |
| 209 | } |
| 210 | } |