mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-09-24 10:58:20 +00:00
ff46f37b56
* Explode boundary point tuples passed to computePosition * Note that we won't use previousSibling instead of array_reverse * Simplify logic using xor Change-Id: I927256e31b5e441aade91b4fd0d83d8f0d89afbe
492 lines
14 KiB
PHP
492 lines
14 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use Error;
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use Exception;
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use Wikimedia\Parsoid\DOM\Comment;
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use Wikimedia\Parsoid\DOM\DocumentFragment;
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use Wikimedia\Parsoid\DOM\DocumentType;
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use Wikimedia\Parsoid\DOM\Node;
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use Wikimedia\Parsoid\DOM\ProcessingInstruction;
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use Wikimedia\Parsoid\DOM\Text;
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/**
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* ImmutableRange has a similar API to the DOM Range class.
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*
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* start/endContainer and offsets can be accessed, as can commonAncestorContainer
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* which is lazy evaluated.
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*
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* setStart and setEnd are still available but return a cloned range.
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*/
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class ImmutableRange {
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private $mCollapsed;
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private $mCommonAncestorContainer;
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private $mEndContainer;
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private $mEndOffset;
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private $mStartContainer;
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private $mStartOffset;
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/**
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* Find the common ancestor container of two nodes
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*
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* @param Node $a
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* @param Node $b
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* @return Node Common ancestor container
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*/
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private static function findCommonAncestorContainer( Node $a, Node $b ): Node {
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$ancestorsA = [];
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$ancestorsB = [];
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do {
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$ancestorsA[] = $a;
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} while ( ( $a = $a->parentNode ) );
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do {
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$ancestorsB[] = $b;
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} while ( ( $b = $b->parentNode ) );
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$node = null;
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while ( end( $ancestorsA ) && end( $ancestorsA ) === end( $ancestorsB ) ) {
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$node = end( $ancestorsA );
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array_pop( $ancestorsA );
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array_pop( $ancestorsB );
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}
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if ( !$node ) {
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throw new Error( 'Nodes are not in the same document' );
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}
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return $node;
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}
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/**
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* Get the root ancestor of a node
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*
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* @param Node $node
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* @return Node
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*/
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private static function getRootNode( Node $node ): Node {
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while ( $node->parentNode ) {
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$node = $node->parentNode;
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'@phan-var Node $node';
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}
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return $node;
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}
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/**
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* @param Node $startNode
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* @param int $startOffset
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* @param Node $endNode
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* @param int $endOffset
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*/
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public function __construct(
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Node $startNode, int $startOffset, Node $endNode, int $endOffset
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) {
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$this->mStartContainer = $startNode;
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$this->mStartOffset = $startOffset;
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$this->mEndContainer = $endNode;
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$this->mEndOffset = $endOffset;
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}
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/**
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* @param string $field Field name
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* @return mixed
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*/
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public function __get( string $field ) {
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switch ( $field ) {
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case 'collapsed':
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return $this->mStartContainer === $this->mEndContainer &&
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$this->mStartOffset === $this->mEndOffset;
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case 'commonAncestorContainer':
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if ( !$this->mCommonAncestorContainer ) {
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$this->mCommonAncestorContainer =
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self::findCommonAncestorContainer( $this->mStartContainer, $this->mEndContainer );
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}
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return $this->mCommonAncestorContainer;
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case 'endContainer':
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return $this->mEndContainer;
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case 'endOffset':
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return $this->mEndOffset;
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case 'startContainer':
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return $this->mStartContainer;
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case 'startOffset':
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return $this->mStartOffset;
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default:
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throw new Exception( 'Invalid property: ' . $field );
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}
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}
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/**
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* Clone range with a new start position
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*
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* @param Node $startNode
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* @param int $startOffset
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* @return self
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*/
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public function setStart( Node $startNode, int $startOffset ): self {
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return new self(
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$startNode, $startOffset, $this->mEndContainer, $this->mEndOffset
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);
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}
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/**
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* Clone range with a new end position
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*
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* @param Node $endNode
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* @param int $endOffset
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* @return self
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*/
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public function setEnd( Node $endNode, int $endOffset ): self {
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return new self(
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$this->mStartContainer, $this->mStartOffset, $endNode, $endOffset
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);
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}
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/**
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* Returns true if only a portion of the Node is contained within the Range.
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*
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* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
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* @see https://dom.spec.whatwg.org/#partially-contained
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*
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* @param Node $node The Node to check against.
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* @return bool
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*/
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private function isPartiallyContainedNode( Node $node ): bool {
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return CommentUtils::contains( $node, $this->mStartContainer ) xor
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CommentUtils::contains( $node, $this->mEndContainer );
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}
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/**
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* Returns true if the entire Node is within the Range, otherwise false.
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*
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* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
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* @see https://dom.spec.whatwg.org/#contained
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*
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* @param Node $node The Node to check against.
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* @return bool
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*/
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private function isFullyContainedNode( Node $node ): bool {
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return self::getRootNode( $node ) === self::getRootNode( $this->mStartContainer )
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&& $this->computePosition( $node, 0, $this->mStartContainer, $this->mStartOffset ) === 'after'
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&& $this->computePosition(
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// @phan-suppress-next-line PhanUndeclaredProperty
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$node, $node->length ?? $node->childNodes->length,
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$this->mEndContainer, $this->mEndOffset
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) === 'before';
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}
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/**
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* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
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* @see https://dom.spec.whatwg.org/#dom-range-clonecontents
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*
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* @return DocumentFragment
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*/
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public function cloneContents(): DocumentFragment {
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$ownerDocument = $this->mStartContainer->ownerDocument;
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$fragment = $ownerDocument->createDocumentFragment();
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if ( $this->mStartContainer === $this->mEndContainer
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&& $this->mStartOffset === $this->mEndOffset
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) {
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return $fragment;
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}
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$originalStartContainer = $this->mStartContainer;
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$originalStartOffset = $this->mStartOffset;
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$originalEndContainer = $this->mEndContainer;
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$originalEndOffset = $this->mEndOffset;
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if ( $originalStartContainer === $originalEndContainer
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&& ( $originalStartContainer instanceof Text
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|| $originalStartContainer instanceof ProcessingInstruction
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|| $originalStartContainer instanceof Comment )
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) {
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$clone = $originalStartContainer->cloneNode();
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$clone->nodeValue = $originalStartContainer->substringData(
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$originalStartOffset,
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$originalEndOffset - $originalStartOffset
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);
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$fragment->appendChild( $clone );
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return $fragment;
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}
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$commonAncestor = self::findCommonAncestorContainer(
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$originalStartContainer,
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$originalEndContainer
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);
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$firstPartiallyContainedChild = null;
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if ( !CommentUtils::contains( $originalStartContainer, $originalEndContainer ) ) {
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foreach ( $commonAncestor->childNodes as $node ) {
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if ( $this->isPartiallyContainedNode( $node ) ) {
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$firstPartiallyContainedChild = $node;
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break;
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}
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}
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}
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$lastPartiallyContainedChild = null;
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// Upstream uses lastChild then iterates over previousSibling, however this
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// is much slower that copying all the nodes to an array, at least when using
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// a native DOMNode, presumably because previousSibling is lazy-evaluated.
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if ( !CommentUtils::contains( $originalEndContainer, $originalStartContainer ) ) {
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$childNodes = iterator_to_array( $commonAncestor->childNodes );
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foreach ( array_reverse( $childNodes ) as $node ) {
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if ( $this->isPartiallyContainedNode( $node ) ) {
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$lastPartiallyContainedChild = $node;
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break;
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}
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}
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}
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$containedChildrenStart = null;
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$containedChildrenEnd = null;
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$child = $firstPartiallyContainedChild ?: $commonAncestor->firstChild;
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for ( ; $child; $child = $child->nextSibling ) {
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if ( $this->isFullyContainedNode( $child ) ) {
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$containedChildrenStart = $child;
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break;
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}
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}
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$child = $lastPartiallyContainedChild ?: $commonAncestor->lastChild;
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for ( ; $child !== $containedChildrenStart; $child = $child->previousSibling ) {
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if ( $this->isFullyContainedNode( $child ) ) {
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$containedChildrenEnd = $child;
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break;
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}
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}
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if ( !$containedChildrenEnd ) {
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$containedChildrenEnd = $containedChildrenStart;
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}
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// $containedChildrenStart and $containedChildrenEnd may be null here, but this loop still works correctly
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for ( $child = $containedChildrenStart; $child !== $containedChildrenEnd; $child = $child->nextSibling ) {
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if ( $child instanceof DocumentType ) {
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throw new Error();
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}
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}
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if ( $firstPartiallyContainedChild instanceof Text
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|| $firstPartiallyContainedChild instanceof ProcessingInstruction
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|| $firstPartiallyContainedChild instanceof Comment
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) {
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$clone = $originalStartContainer->cloneNode();
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// @phan-suppress-next-line PhanUndeclaredMethod
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$clone->nodeValue = $originalStartContainer->substringData(
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$originalStartOffset,
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// @phan-suppress-next-line PhanUndeclaredProperty
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$originalStartContainer->length - $originalStartOffset
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);
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$fragment->appendChild( $clone );
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} elseif ( $firstPartiallyContainedChild ) {
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$clone = $firstPartiallyContainedChild->cloneNode();
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$fragment->appendChild( $clone );
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$subrange = new self(
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$originalStartContainer, $originalStartOffset,
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$firstPartiallyContainedChild,
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// @phan-suppress-next-line PhanUndeclaredProperty
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$firstPartiallyContainedChild->length ?? $firstPartiallyContainedChild->childNodes->length
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);
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$subfragment = $subrange->cloneContents();
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if ( $subfragment->hasChildNodes() ) {
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$clone->appendChild( $subfragment );
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}
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}
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// $containedChildrenStart and $containedChildrenEnd may be null here, but this loop still works correctly
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for ( $child = $containedChildrenStart; $child !== $containedChildrenEnd; $child = $child->nextSibling ) {
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$clone = $child->cloneNode( true );
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$fragment->appendChild( $clone );
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}
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// If not null, this node wasn't processed by the loop
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if ( $containedChildrenEnd ) {
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$clone = $containedChildrenEnd->cloneNode( true );
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$fragment->appendChild( $clone );
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}
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if ( $lastPartiallyContainedChild instanceof Text
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|| $lastPartiallyContainedChild instanceof ProcessingInstruction
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|| $lastPartiallyContainedChild instanceof Comment
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) {
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$clone = $originalEndContainer->cloneNode();
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// @phan-suppress-next-line PhanUndeclaredMethod
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$clone->nodeValue = $originalEndContainer->substringData(
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0,
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$originalEndOffset
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);
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$fragment->appendChild( $clone );
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} elseif ( $lastPartiallyContainedChild ) {
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$clone = $lastPartiallyContainedChild->cloneNode();
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$fragment->appendChild( $clone );
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$subrange = new self(
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$lastPartiallyContainedChild, 0,
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$originalEndContainer, $originalEndOffset
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);
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$subfragment = $subrange->cloneContents();
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if ( $subfragment->hasChildNodes() ) {
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$clone->appendChild( $subfragment );
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}
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}
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return $fragment;
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}
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/**
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* Inserts a new Node into at the start of the Range.
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*
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* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
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*
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* @see https://dom.spec.whatwg.org/#dom-range-insertnode
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*
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* @param Node $node The Node to be inserted.
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* @return void
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*/
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public function insertNode( Node $node ): void {
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if ( ( $this->mStartContainer instanceof ProcessingInstruction
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|| $this->mStartContainer instanceof Comment )
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|| ( $this->mStartContainer instanceof Text
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&& $this->mStartContainer->parentNode === null )
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) {
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throw new Error();
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}
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$referenceNode = null;
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if ( $this->mStartContainer instanceof Text ) {
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$referenceNode = $this->mStartContainer;
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} else {
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$referenceNode = $this
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->mStartContainer
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->childNodes
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->item( $this->mStartOffset );
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}
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$parent = !$referenceNode
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? $this->mStartContainer
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: $referenceNode->parentNode;
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// TODO: Restore this validation check?
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// $parent->ensurePreinsertionValidity( $node, $referenceNode );
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if ( $this->mStartContainer instanceof Text ) {
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$referenceNode = $this->mStartContainer->splitText( $this->mStartOffset );
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}
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if ( $node === $referenceNode ) {
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$referenceNode = $referenceNode->nextSibling;
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}
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if ( $node->parentNode ) {
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$node->parentNode->removeChild( $node );
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}
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// TODO: Restore this validation check?
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// $parent->preinsertNode( $node, $referenceNode );
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// $referenceNode may be null, this is okay
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$parent->insertBefore( $node, $referenceNode );
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}
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/**
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* Compares the position of two boundary points.
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*
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* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
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* @internal
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*
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* @see https://dom.spec.whatwg.org/#concept-range-bp-position
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*
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* @param Node $nodeA
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* @param int $offsetA
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* @param Node $nodeB
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* @param int $offsetB
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* @return string 'before'|'after'|'equal'
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*/
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private function computePosition(
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Node $nodeA, int $offsetA, Node $nodeB, int $offsetB
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): string {
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// 1. Assert: nodeA and nodeB have the same root.
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// Removed, not necessary for our usage
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// 2. If nodeA is nodeB, then return equal if offsetA is offsetB, before if offsetA is less than offsetB, and
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// after if offsetA is greater than offsetB.
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if ( $nodeA === $nodeB ) {
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if ( $offsetA === $offsetB ) {
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return 'equal';
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} elseif ( $offsetA < $offsetB ) {
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return 'before';
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} else {
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return 'after';
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}
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}
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$commonAncestor = $this->findCommonAncestorContainer( $nodeB, $nodeA );
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if ( $commonAncestor === $nodeA ) {
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$AFollowsB = false;
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} elseif ( $commonAncestor === $nodeB ) {
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$AFollowsB = true;
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} else {
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// A was not found inside B. Traverse both A & B up to the nodes
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// before their common ancestor, then see if A is in the nextSibling
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// chain of B.
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$b = $nodeB;
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while ( $b->parentNode !== $commonAncestor ) {
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$b = $b->parentNode;
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}
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$a = $nodeA;
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while ( $a->parentNode !== $commonAncestor ) {
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$a = $a->parentNode;
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}
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$AFollowsB = false;
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while ( $b ) {
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if ( $a === $b ) {
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$AFollowsB = true;
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break;
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}
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$b = $b->nextSibling;
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}
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}
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if ( $AFollowsB ) {
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// Swap variables
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[ $nodeB, $nodeA ] = [ $nodeA, $nodeB ];
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[ $offsetB, $offsetA ] = [ $offsetA, $offsetB ];
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}
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$ancestor = $nodeB->parentNode;
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while ( $ancestor ) {
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if ( $ancestor === $nodeA ) {
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break;
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}
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$ancestor = $ancestor->parentNode;
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}
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if ( $ancestor ) {
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$child = $nodeB;
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while ( $child ) {
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if ( $child->parentNode === $nodeA ) {
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break;
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}
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$child = $child->parentNode;
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}
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// Phan complains that $child may be null here, but that can't happen, because at this point
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// we know that $nodeA is an ancestor of $nodeB, so the loop above will stop before the root.
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// @phan-suppress-next-line PhanTypeMismatchArgumentNullable
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if ( CommentUtils::childIndexOf( $child ) < $offsetA ) {
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return $AFollowsB ? 'before' : 'after';
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}
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}
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return $AFollowsB ? 'after' : 'before';
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}
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}
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