mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-24 00:13:36 +00:00
837 lines
24 KiB
PHP
837 lines
24 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\Assert\Assert;
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use Wikimedia\Parsoid\DOM\CharacterData;
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use Wikimedia\Parsoid\DOM\Comment;
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use Wikimedia\Parsoid\DOM\Document;
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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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* @property bool $collapsed
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* @property Node $commonAncestorContainer
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* @property Node $endContainer
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* @property int $endOffset
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* @property Node $startContainer
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* @property int $startOffset
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*/
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class ImmutableRange {
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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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static::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 $this->setStartOrEnd( 'start', $startNode, $startOffset );
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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 $this->setStartOrEnd( 'end', $endNode, $endOffset );
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}
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/**
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* Sets the start or end boundary point for 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/#concept-range-bp-set
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*
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* @param string $type Which boundary point should be set. Valid values are start or end.
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* @param Node $node The Node that will become the boundary.
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* @param int $offset The offset within the given Node that will be the boundary.
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* @return self
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*/
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private function setStartOrEnd( string $type, Node $node, int $offset ): self {
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if ( $node instanceof DocumentType ) {
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throw new Error();
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}
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switch ( $type ) {
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case 'start':
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$endContainer = $this->mEndContainer;
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$endOffset = $this->mEndOffset;
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if (
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self::getRootNode( $this->mStartContainer ) !== self::getRootNode( $node ) ||
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$this->computePosition(
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$node, $offset, $this->mEndContainer, $this->mEndOffset
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) === 'after'
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) {
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$endContainer = $node;
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$endOffset = $offset;
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}
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return new self(
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$node, $offset, $endContainer, $endOffset
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);
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case 'end':
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$startContainer = $this->mStartContainer;
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$startOffset = $this->mStartOffset;
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if (
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self::getRootNode( $this->mStartContainer ) !== self::getRootNode( $node ) ||
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$this->computePosition(
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$node, $offset, $this->mStartContainer, $this->mStartOffset
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) === 'before'
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) {
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$startContainer = $node;
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$startOffset = $offset;
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}
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return new self(
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$startContainer, $startOffset, $node, $offset
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);
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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 static::getRootNode( $node ) === static::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, $this->mEndOffset
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) === 'before';
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}
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/**
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* Extracts the content of the Range from the node tree and places it in a
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* DocumentFragment.
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*
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* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
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* @see https://dom.spec.whatwg.org/#dom-range-extractcontents
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*
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* @return DocumentFragment
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*/
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public function extractContents(): DocumentFragment {
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$fragment = $this->mStartContainer->ownerDocument->createDocumentFragment();
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if (
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$this->mStartContainer === $this->mEndContainer
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&& $this->mStartOffset === $this->mEndOffset
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) {
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return $fragment;
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}
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$originalStartNode = $this->mStartContainer;
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$originalStartOffset = $this->mStartOffset;
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$originalEndNode = $this->mEndContainer;
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$originalEndOffset = $this->mEndOffset;
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if (
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$originalStartNode === $originalEndNode
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&& ( $originalStartNode instanceof Text
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|| $originalStartNode instanceof ProcessingInstruction
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|| $originalStartNode instanceof Comment )
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) {
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$clone = $originalStartNode->cloneNode();
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Assert::precondition( $clone instanceof CharacterData, 'TODO' );
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$clone->data = $originalStartNode->substringData(
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$originalStartOffset,
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$originalEndOffset - $originalStartOffset
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);
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$fragment->appendChild( $clone );
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$originalStartNode->replaceData(
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$originalStartOffset,
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$originalEndOffset - $originalStartOffset,
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''
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);
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return $fragment;
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}
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$commonAncestor = $this->commonAncestorContainer;
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// It should be impossible for common ancestor to be null here since both nodes should be
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// in the same tree.
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Assert::precondition( $commonAncestor !== null, 'TODO' );
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$firstPartiallyContainedChild = null;
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if ( !CommentUtils::contains( $originalStartNode, $originalEndNode ) ) {
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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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if ( !CommentUtils::contains( $originalEndNode, $originalStartNode ) ) {
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$node = $commonAncestor->lastChild;
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while ( $node ) {
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if ( $this->isPartiallyContainedNode( $node ) ) {
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$lastPartiallyContainedChild = $node;
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break;
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}
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$node = $node->previousSibling;
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}
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}
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$containedChildren = [];
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foreach ( $commonAncestor->childNodes as $childNode ) {
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if ( $this->isFullyContainedNode( $childNode ) ) {
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if ( $childNode instanceof DocumentType ) {
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throw new Error();
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}
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$containedChildren[] = $childNode;
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}
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}
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if ( CommentUtils::contains( $originalStartNode, $originalEndNode ) ) {
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$newNode = $originalStartNode;
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$newOffset = $originalStartOffset;
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} else {
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$referenceNode = $originalStartNode;
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$parent = $referenceNode->parentNode;
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while ( $parent && !CommentUtils::contains( $parent, $originalEndNode ) ) {
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$referenceNode = $parent;
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$parent = $referenceNode->parentNode;
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}
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// Note: If reference node’s parent is null, it would be the root of range, so would be an inclusive
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// ancestor of original end node, and we could not reach this point.
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Assert::precondition( $parent !== null, 'TODO' );
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$newNode = $parent;
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$newOffset = CommentUtils::childIndexOf( $referenceNode ) + 1;
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}
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if (
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$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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// Note: In this case, first partially contained child is original start node.
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Assert::precondition( $originalStartNode instanceof CharacterData, 'TODO' );
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$clone = $originalStartNode->cloneNode();
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Assert::precondition( $clone instanceof CharacterData, 'TODO' );
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$clone->data = $originalStartNode->substringData(
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$originalStartOffset,
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$originalStartNode->length - $originalStartOffset
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);
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$fragment->appendChild( $clone );
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$originalStartNode->replaceData(
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$originalStartOffset,
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$originalStartNode->length - $originalStartOffset,
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''
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);
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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 = clone $this;
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$subrange->mStartContainer = $originalStartNode;
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$subrange->mStartOffset = $originalStartOffset;
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$subrange->mEndContainer = $firstPartiallyContainedChild;
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$subrange->mEndOffset = count( $firstPartiallyContainedChild->childNodes );
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$subfragment = $subrange->extractContents();
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$clone->appendChild( $subfragment );
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}
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foreach ( $containedChildren as $child ) {
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$fragment->appendChild( $child );
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}
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if (
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$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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// Note: In this case, last partially contained child is original end node.
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Assert::precondition( $originalEndNode instanceof CharacterData, 'TODO' );
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$clone = $originalEndNode->cloneNode();
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Assert::precondition( $clone instanceof CharacterData, 'TODO' );
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$clone->data = $originalEndNode->substringData( 0, $originalEndOffset );
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$fragment->appendChild( $clone );
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$originalEndNode->replaceData( 0, $originalEndOffset, '' );
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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 = clone $this;
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$subrange->mStartContainer = $lastPartiallyContainedChild;
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$subrange->mStartOffset = 0;
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$subrange->mEndContainer = $originalEndNode;
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$subrange->mEndOffset = $originalEndOffset;
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$subfragment = $subrange->extractContents();
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$clone->appendChild( $subfragment );
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}
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$this->mStartContainer = $newNode;
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$this->mStartOffset = $newOffset;
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$this->mEndContainer = $newNode;
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$this->mEndOffset = $newOffset;
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return $fragment;
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}
|
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|
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/**
|
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* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
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* @see https://dom.spec.whatwg.org/#dom-range-clonecontents
|
||
*
|
||
* @return DocumentFragment
|
||
*/
|
||
public function cloneContents(): DocumentFragment {
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$ownerDocument = $this->mStartContainer->ownerDocument;
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$fragment = $ownerDocument->createDocumentFragment();
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||
|
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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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}
|
||
|
||
$originalStartContainer = $this->mStartContainer;
|
||
$originalStartOffset = $this->mStartOffset;
|
||
$originalEndContainer = $this->mEndContainer;
|
||
$originalEndOffset = $this->mEndOffset;
|
||
|
||
if ( $originalStartContainer === $originalEndContainer
|
||
&& ( $originalStartContainer instanceof Text
|
||
|| $originalStartContainer instanceof ProcessingInstruction
|
||
|| $originalStartContainer instanceof Comment )
|
||
) {
|
||
$clone = $originalStartContainer->cloneNode();
|
||
$clone->nodeValue = $originalStartContainer->substringData(
|
||
$originalStartOffset,
|
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$originalEndOffset - $originalStartOffset
|
||
);
|
||
$fragment->appendChild( $clone );
|
||
|
||
return $fragment;
|
||
}
|
||
|
||
$commonAncestor = static::findCommonAncestorContainer(
|
||
$originalStartContainer,
|
||
$originalEndContainer
|
||
);
|
||
$firstPartiallyContainedChild = null;
|
||
|
||
if ( !CommentUtils::contains( $originalStartContainer, $originalEndContainer ) ) {
|
||
foreach ( $commonAncestor->childNodes as $node ) {
|
||
if ( $this->isPartiallyContainedNode( $node ) ) {
|
||
$firstPartiallyContainedChild = $node;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
$lastPartiallyContainedChild = null;
|
||
|
||
// Upstream uses lastChild then iterates over previousSibling, however this
|
||
// is much slower that copying all the nodes to an array, at least when using
|
||
// a native DOMNode, presumably because previousSibling is lazy-evaluated.
|
||
if ( !CommentUtils::contains( $originalEndContainer, $originalStartContainer ) ) {
|
||
$childNodes = iterator_to_array( $commonAncestor->childNodes );
|
||
|
||
foreach ( array_reverse( $childNodes ) as $node ) {
|
||
if ( $this->isPartiallyContainedNode( $node ) ) {
|
||
$lastPartiallyContainedChild = $node;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
$containedChildrenStart = null;
|
||
$containedChildrenEnd = null;
|
||
|
||
$child = $firstPartiallyContainedChild ?: $commonAncestor->firstChild;
|
||
for ( ; $child; $child = $child->nextSibling ) {
|
||
if ( $this->isFullyContainedNode( $child ) ) {
|
||
$containedChildrenStart = $child;
|
||
break;
|
||
}
|
||
}
|
||
|
||
$child = $lastPartiallyContainedChild ?: $commonAncestor->lastChild;
|
||
for ( ; $child !== $containedChildrenStart; $child = $child->previousSibling ) {
|
||
if ( $this->isFullyContainedNode( $child ) ) {
|
||
$containedChildrenEnd = $child;
|
||
break;
|
||
}
|
||
}
|
||
if ( !$containedChildrenEnd ) {
|
||
$containedChildrenEnd = $containedChildrenStart;
|
||
}
|
||
|
||
// $containedChildrenStart and $containedChildrenEnd may be null here, but this loop still works correctly
|
||
for ( $child = $containedChildrenStart; $child !== $containedChildrenEnd; $child = $child->nextSibling ) {
|
||
if ( $child instanceof DocumentType ) {
|
||
throw new Error();
|
||
}
|
||
}
|
||
|
||
if ( $firstPartiallyContainedChild instanceof Text
|
||
|| $firstPartiallyContainedChild instanceof ProcessingInstruction
|
||
|| $firstPartiallyContainedChild instanceof Comment
|
||
) {
|
||
$clone = $originalStartContainer->cloneNode();
|
||
Assert::precondition(
|
||
$firstPartiallyContainedChild === $originalStartContainer,
|
||
'Only possible when the node is the startContainer'
|
||
);
|
||
$clone->nodeValue = $firstPartiallyContainedChild->substringData(
|
||
$originalStartOffset,
|
||
$firstPartiallyContainedChild->length - $originalStartOffset
|
||
);
|
||
$fragment->appendChild( $clone );
|
||
} elseif ( $firstPartiallyContainedChild ) {
|
||
$clone = $firstPartiallyContainedChild->cloneNode();
|
||
$fragment->appendChild( $clone );
|
||
$subrange = new self(
|
||
$originalStartContainer, $originalStartOffset,
|
||
$firstPartiallyContainedChild,
|
||
// @phan-suppress-next-line PhanUndeclaredProperty
|
||
$firstPartiallyContainedChild->length ?? $firstPartiallyContainedChild->childNodes->length
|
||
);
|
||
$subfragment = $subrange->cloneContents();
|
||
if ( $subfragment->hasChildNodes() ) {
|
||
$clone->appendChild( $subfragment );
|
||
}
|
||
}
|
||
|
||
// $containedChildrenStart and $containedChildrenEnd may be null here, but this loop still works correctly
|
||
for ( $child = $containedChildrenStart; $child !== $containedChildrenEnd; $child = $child->nextSibling ) {
|
||
$clone = $child->cloneNode( true );
|
||
$fragment->appendChild( $clone );
|
||
}
|
||
// If not null, this node wasn't processed by the loop
|
||
if ( $containedChildrenEnd ) {
|
||
$clone = $containedChildrenEnd->cloneNode( true );
|
||
$fragment->appendChild( $clone );
|
||
}
|
||
|
||
if ( $lastPartiallyContainedChild instanceof Text
|
||
|| $lastPartiallyContainedChild instanceof ProcessingInstruction
|
||
|| $lastPartiallyContainedChild instanceof Comment
|
||
) {
|
||
Assert::precondition(
|
||
$lastPartiallyContainedChild === $originalEndContainer,
|
||
'Only possible when the node is the endContainer'
|
||
);
|
||
$clone = $lastPartiallyContainedChild->cloneNode();
|
||
$clone->nodeValue = $lastPartiallyContainedChild->substringData(
|
||
0,
|
||
$originalEndOffset
|
||
);
|
||
$fragment->appendChild( $clone );
|
||
} elseif ( $lastPartiallyContainedChild ) {
|
||
$clone = $lastPartiallyContainedChild->cloneNode();
|
||
$fragment->appendChild( $clone );
|
||
$subrange = new self(
|
||
$lastPartiallyContainedChild, 0,
|
||
$originalEndContainer, $originalEndOffset
|
||
);
|
||
$subfragment = $subrange->cloneContents();
|
||
if ( $subfragment->hasChildNodes() ) {
|
||
$clone->appendChild( $subfragment );
|
||
}
|
||
}
|
||
|
||
return $fragment;
|
||
}
|
||
|
||
/**
|
||
* Inserts a new Node into at the start of the Range.
|
||
*
|
||
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
||
*
|
||
* @see https://dom.spec.whatwg.org/#dom-range-insertnode
|
||
*
|
||
* @param Node $node The Node to be inserted.
|
||
* @return void
|
||
*/
|
||
public function insertNode( Node $node ): void {
|
||
if ( ( $this->mStartContainer instanceof ProcessingInstruction
|
||
|| $this->mStartContainer instanceof Comment )
|
||
|| ( $this->mStartContainer instanceof Text
|
||
&& $this->mStartContainer->parentNode === null )
|
||
) {
|
||
throw new Error();
|
||
}
|
||
|
||
$referenceNode = null;
|
||
|
||
if ( $this->mStartContainer instanceof Text ) {
|
||
$referenceNode = $this->mStartContainer;
|
||
} else {
|
||
$referenceNode = $this
|
||
->mStartContainer
|
||
->childNodes
|
||
->item( $this->mStartOffset );
|
||
}
|
||
|
||
$parent = !$referenceNode
|
||
? $this->mStartContainer
|
||
: $referenceNode->parentNode;
|
||
// TODO: Restore this validation check?
|
||
// $parent->ensurePreinsertionValidity( $node, $referenceNode );
|
||
|
||
if ( $this->mStartContainer instanceof Text ) {
|
||
$referenceNode = $this->mStartContainer->splitText( $this->mStartOffset );
|
||
}
|
||
|
||
if ( $node === $referenceNode ) {
|
||
$referenceNode = $referenceNode->nextSibling;
|
||
}
|
||
|
||
if ( $node->parentNode ) {
|
||
$node->parentNode->removeChild( $node );
|
||
}
|
||
|
||
// TODO: Restore this validation check?
|
||
// $parent->preinsertNode( $node, $referenceNode );
|
||
|
||
// $referenceNode may be null, this is okay
|
||
$parent->insertBefore( $node, $referenceNode );
|
||
}
|
||
|
||
/**
|
||
* Wraps the content of Range in a new Node and inserts it in to the Document.
|
||
*
|
||
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
||
*
|
||
* @see https://dom.spec.whatwg.org/#dom-range-surroundcontents
|
||
*
|
||
* @param Node $newParent New parent node for contents
|
||
* @return void
|
||
*/
|
||
public function surroundContents( Node $newParent ): void {
|
||
$commonAncestor = $this->commonAncestorContainer;
|
||
|
||
if ( $commonAncestor ) {
|
||
$tw = new TreeWalker( $commonAncestor );
|
||
$node = $tw->nextNode();
|
||
|
||
while ( $node ) {
|
||
if ( !$node instanceof Text && $this->isPartiallyContainedNode( $node ) ) {
|
||
throw new Error();
|
||
}
|
||
|
||
$node = $tw->nextNode();
|
||
}
|
||
}
|
||
|
||
if (
|
||
$newParent instanceof Document
|
||
|| $newParent instanceof DocumentType
|
||
|| $newParent instanceof DocumentFragment
|
||
) {
|
||
throw new Error();
|
||
}
|
||
|
||
$fragment = $this->extractContents();
|
||
|
||
while ( $newParent->firstChild ) {
|
||
$newParent->removeChild( $newParent->firstChild );
|
||
}
|
||
|
||
$this->insertNode( $newParent );
|
||
$newParent->appendChild( $fragment );
|
||
// TODO: Return new range?
|
||
}
|
||
|
||
/**
|
||
* Compares the position of two boundary points.
|
||
*
|
||
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
||
* @internal
|
||
*
|
||
* @see https://dom.spec.whatwg.org/#concept-range-bp-position
|
||
*
|
||
* @param Node $nodeA
|
||
* @param int $offsetA
|
||
* @param Node $nodeB
|
||
* @param int $offsetB
|
||
* @return string 'before'|'after'|'equal'
|
||
*/
|
||
private function computePosition(
|
||
Node $nodeA, int $offsetA, Node $nodeB, int $offsetB
|
||
): string {
|
||
// 1. Assert: nodeA and nodeB have the same root.
|
||
// Removed, not necessary for our usage
|
||
|
||
// 2. If nodeA is nodeB, then return equal if offsetA is offsetB, before if offsetA is less than offsetB, and
|
||
// after if offsetA is greater than offsetB.
|
||
if ( $nodeA === $nodeB ) {
|
||
if ( $offsetA === $offsetB ) {
|
||
return 'equal';
|
||
} elseif ( $offsetA < $offsetB ) {
|
||
return 'before';
|
||
} else {
|
||
return 'after';
|
||
}
|
||
}
|
||
|
||
$commonAncestor = $this->findCommonAncestorContainer( $nodeB, $nodeA );
|
||
if ( $commonAncestor === $nodeA ) {
|
||
$AFollowsB = false;
|
||
} elseif ( $commonAncestor === $nodeB ) {
|
||
$AFollowsB = true;
|
||
} else {
|
||
// A was not found inside B. Traverse both A & B up to the nodes
|
||
// before their common ancestor, then see if A is in the nextSibling
|
||
// chain of B.
|
||
$b = $nodeB;
|
||
while ( $b->parentNode !== $commonAncestor ) {
|
||
$b = $b->parentNode;
|
||
}
|
||
$a = $nodeA;
|
||
while ( $a->parentNode !== $commonAncestor ) {
|
||
$a = $a->parentNode;
|
||
}
|
||
$AFollowsB = false;
|
||
while ( $b ) {
|
||
if ( $a === $b ) {
|
||
$AFollowsB = true;
|
||
break;
|
||
}
|
||
$b = $b->nextSibling;
|
||
}
|
||
}
|
||
|
||
if ( $AFollowsB ) {
|
||
// Swap variables
|
||
[ $nodeB, $nodeA ] = [ $nodeA, $nodeB ];
|
||
[ $offsetB, $offsetA ] = [ $offsetA, $offsetB ];
|
||
}
|
||
|
||
$ancestor = $nodeB->parentNode;
|
||
|
||
while ( $ancestor ) {
|
||
if ( $ancestor === $nodeA ) {
|
||
break;
|
||
}
|
||
|
||
$ancestor = $ancestor->parentNode;
|
||
}
|
||
|
||
if ( $ancestor ) {
|
||
$child = $nodeB;
|
||
|
||
while ( $child ) {
|
||
if ( $child->parentNode === $nodeA ) {
|
||
break;
|
||
}
|
||
|
||
$child = $child->parentNode;
|
||
}
|
||
|
||
// Phan complains that $child may be null here, but that can't happen, because at this point
|
||
// we know that $nodeA is an ancestor of $nodeB, so the loop above will stop before the root.
|
||
// @phan-suppress-next-line PhanTypeMismatchArgumentNullable
|
||
if ( CommentUtils::childIndexOf( $child ) < $offsetA ) {
|
||
return $AFollowsB ? 'before' : 'after';
|
||
}
|
||
}
|
||
|
||
return $AFollowsB ? 'after' : 'before';
|
||
}
|
||
|
||
public const START_TO_START = 0;
|
||
public const START_TO_END = 1;
|
||
public const END_TO_END = 2;
|
||
public const END_TO_START = 3;
|
||
|
||
/**
|
||
* Compares the boundary points of this Range with another Range.
|
||
*
|
||
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
||
*
|
||
* @see https://dom.spec.whatwg.org/#dom-range-compareboundarypoints
|
||
*
|
||
* @param int $how One of ImmutableRange::END_TO_END, ImmutableRange::END_TO_START,
|
||
* ImmutableRange::START_TO_END, ImmutableRange::START_TO_START
|
||
* @param ImmutableRange $sourceRange A Range whose boundary points are to be compared.
|
||
* @return int -1, 0, or 1
|
||
*/
|
||
public function compareBoundaryPoints( int $how, self $sourceRange ): int {
|
||
if ( static::getRootNode( $this->mStartContainer ) !== static::getRootNode( $sourceRange->startContainer ) ) {
|
||
throw new Error();
|
||
}
|
||
|
||
switch ( $how ) {
|
||
case static::START_TO_START:
|
||
$thisPoint = [ $this->mStartContainer, $this->mStartOffset ];
|
||
$otherPoint = [ $sourceRange->startContainer, $sourceRange->startOffset ];
|
||
break;
|
||
|
||
case static::START_TO_END:
|
||
$thisPoint = [ $this->mEndContainer, $this->mEndOffset ];
|
||
$otherPoint = [ $sourceRange->startContainer, $sourceRange->startOffset ];
|
||
break;
|
||
|
||
case static::END_TO_END:
|
||
$thisPoint = [ $this->mEndContainer, $this->mEndOffset ];
|
||
$otherPoint = [ $sourceRange->endContainer, $sourceRange->endOffset ];
|
||
break;
|
||
|
||
case static::END_TO_START:
|
||
$thisPoint = [ $this->mStartContainer, $this->mStartOffset ];
|
||
$otherPoint = [ $sourceRange->endContainer, $sourceRange->endOffset ];
|
||
break;
|
||
|
||
default:
|
||
throw new Error();
|
||
}
|
||
|
||
switch ( $this->computePosition( ...$thisPoint, ...$otherPoint ) ) {
|
||
case 'before':
|
||
return -1;
|
||
|
||
case 'equal':
|
||
return 0;
|
||
|
||
case 'after':
|
||
return 1;
|
||
|
||
default:
|
||
throw new Error();
|
||
}
|
||
}
|
||
}
|