mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-12-11 08:08:37 +00:00
490 lines
14 KiB
PHP
490 lines
14 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use DOMComment;
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use DOMDocumentFragment;
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use DOMDocumentType;
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use DOMNode;
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use DOMProcessingInstruction;
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use DOMText;
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use Error;
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use Exception;
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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 DOMNode $a
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* @param DOMNode $b
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* @return DOMNode Common ancestor container
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*/
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private static function findCommonAncestorContainer( DOMNode $a, DOMNode $b ) : DOMNode {
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$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 DOMNode $node
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* @return DOMNode
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*/
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private static function getRootNode( DOMNode $node ) : DOMNode {
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while ( $node->parentNode ) {
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$node = $node->parentNode;
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}
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return $node;
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}
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/**
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* @param DOMNode $startNode
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* @param int $startOffset
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* @param DOMNode $endNode
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* @param int $endOffset
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*/
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public function __construct(
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DOMNode $startNode, int $startOffset, DOMNode $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 DOMNode $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( DOMNode $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 DOMNode $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( DOMNode $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 DOMNode $node The Node to check against.
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* @return bool
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*/
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private function isPartiallyContainedNode( DOMNode $node ) : bool {
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$isAncestorOfStart = CommentUtils::contains( $node, $this->mStartContainer );
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$isAncestorOfEnd = CommentUtils::contains( $node, $this->mEndContainer );
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return ( $isAncestorOfStart && !$isAncestorOfEnd )
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|| ( !$isAncestorOfStart && $isAncestorOfEnd );
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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 DOMNode $node The Node to check against.
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* @return bool
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*/
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private function isFullyContainedNode( DOMNode $node ) : bool {
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$startBP = [ $this->mStartContainer, $this->mStartOffset ];
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$endBP = [ $this->mEndContainer, $this->mEndOffset ];
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$root = self::getRootNode( $this->mStartContainer );
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return self::getRootNode( $node ) === $root
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&& $this->computePosition( [ $node, 0 ], $startBP ) === 'after'
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&& $this->computePosition(
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[ $node, strlen( $node->nodeValue ) ],
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$endBP
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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 DOMDocumentFragment
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*/
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public function cloneContents() : DOMDocumentFragment {
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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 DOMText
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|| $originalStartContainer instanceof DOMProcessingInstruction
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|| $originalStartContainer instanceof DOMComment )
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) {
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$clone = $originalStartContainer->cloneNode();
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$clone->nodeValue = substr(
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$originalStartContainer->nodeValue,
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$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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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 DOMDocumentType ) {
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throw new Error();
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}
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}
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if ( $firstPartiallyContainedChild instanceof DOMText
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|| $firstPartiallyContainedChild instanceof DOMProcessingInstruction
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|| $firstPartiallyContainedChild instanceof DOMComment
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) {
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$clone = $originalStartContainer->cloneNode();
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$clone->nodeValue = substr(
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$originalStartContainer->nodeValue,
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$originalStartOffset,
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strlen( $originalStartContainer->nodeValue ) - $originalStartOffset
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);
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$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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strlen( $firstPartiallyContainedChild->nodeValue )
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);
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$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 DOMText
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|| $lastPartiallyContainedChild instanceof DOMProcessingInstruction
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|| $lastPartiallyContainedChild instanceof DOMComment
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) {
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$clone = $originalEndContainer->cloneNode();
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$clone->nodeValue = substr(
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$originalEndContainer->nodeValue,
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0,
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$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 DOMNode $node The Node to be inserted.
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* @return void
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*/
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public function insertNode( DOMNode $node ) : void {
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if ( ( $this->mStartContainer instanceof DOMProcessingInstruction
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|| $this->mStartContainer instanceof DOMComment )
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|| ( $this->mStartContainer instanceof DOMText
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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 ( $this->mStartContainer instanceof DOMText ) {
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$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 ( $this->mStartContainer instanceof DOMText ) {
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$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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//
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// This should just be
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// $parent->insertBefore( $node, $referenceNode );
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// but the second argument is optional, not nullable
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if ( $referenceNode ) {
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$parent->insertBefore( $node, $referenceNode );
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} else {
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$parent->insertBefore( $node );
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}
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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 mixed[] $boundaryPointA An array containing a Node and an offset within that Node representing a boundary.
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* @param mixed[] $boundaryPointB An array containing a Node and an offset within that Node representing a boundary.
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* @return string Returns before, equal, or after based on the position of the first boundary relative to the second
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* boundary.
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*/
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private function computePosition(
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array $boundaryPointA,
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array $boundaryPointB
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) : string {
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if ( $boundaryPointA[0] === $boundaryPointB[0] ) {
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if ( $boundaryPointA[1] === $boundaryPointB[1] ) {
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return 'equal';
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} elseif ( $boundaryPointA[1] < $boundaryPointB[1] ) {
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return 'before';
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} else {
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return 'after';
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}
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}
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$commonAncestor = $this->findCommonAncestorContainer( $boundaryPointB[0], $boundaryPointA[0] );
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if ( $commonAncestor === $boundaryPointA[0] ) {
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$AFollowsB = false;
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} elseif ( $commonAncestor === $boundaryPointB[0] ) {
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$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 = $boundaryPointB[0];
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while ( $b->parentNode !== $commonAncestor ) {
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$b = $b->parentNode;
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}
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$a = $boundaryPointA[0];
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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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[ $boundaryPointB, $boundaryPointA ] = [ $boundaryPointA, $boundaryPointB ];
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}
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$ancestor = $boundaryPointB[0]->parentNode;
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while ( $ancestor ) {
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if ( $ancestor === $boundaryPointA[0] ) {
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break;
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}
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$ancestor = $ancestor->parentNode;
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}
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if ( $ancestor ) {
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$child = $boundaryPointB[0];
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while ( $child ) {
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if ( $child->parentNode === $boundaryPointA[0] ) {
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break;
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}
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$child = $child->parentNode;
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}
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if ( CommentUtils::childIndexOf( $child ) < $boundaryPointA[1] ) {
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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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