mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-12 09:58:17 +00:00
490 lines
14 KiB
PHP
490 lines
14 KiB
PHP
<?php
|
|
|
|
namespace MediaWiki\Extension\DiscussionTools;
|
|
|
|
use DOMComment;
|
|
use DOMDocumentFragment;
|
|
use DOMDocumentType;
|
|
use DOMNode;
|
|
use DOMProcessingInstruction;
|
|
use DOMText;
|
|
use Error;
|
|
use Exception;
|
|
|
|
/**
|
|
* ImmutableRange has a similar API to the DOM Range class.
|
|
*
|
|
* start/endContainer and offsets can be accessed, as can commonAncestorContainer
|
|
* which is lazy evaluated.
|
|
*
|
|
* setStart and setEnd are still available but return a cloned range.
|
|
*/
|
|
class ImmutableRange {
|
|
private $mCollapsed;
|
|
private $mCommonAncestorContainer;
|
|
private $mEndContainer;
|
|
private $mEndOffset;
|
|
private $mStartContainer;
|
|
private $mStartOffset;
|
|
|
|
/**
|
|
* Find the common ancestor container of two nodes
|
|
*
|
|
* @param DOMNode $a
|
|
* @param DOMNode $b
|
|
* @return DOMNode Common ancestor container
|
|
*/
|
|
private static function findCommonAncestorContainer( DOMNode $a, DOMNode $b ) : DOMNode {
|
|
$ancestorsA = [];
|
|
$ancestorsB = [];
|
|
|
|
do {
|
|
$ancestorsA[] = $a;
|
|
} while ( ( $a = $a->parentNode ) );
|
|
do {
|
|
$ancestorsB[] = $b;
|
|
} while ( ( $b = $b->parentNode ) );
|
|
|
|
$node = null;
|
|
while ( end( $ancestorsA ) && end( $ancestorsA ) === end( $ancestorsB ) ) {
|
|
$node = end( $ancestorsA );
|
|
array_pop( $ancestorsA );
|
|
array_pop( $ancestorsB );
|
|
}
|
|
if ( !$node ) {
|
|
throw new Error( 'Nodes are not in the same document' );
|
|
}
|
|
|
|
return $node;
|
|
}
|
|
|
|
/**
|
|
* Get the root ancestor of a node
|
|
*
|
|
* @param DOMNode $node
|
|
* @return DOMNode
|
|
*/
|
|
private static function getRootNode( DOMNode $node ) : DOMNode {
|
|
while ( $node->parentNode ) {
|
|
$node = $node->parentNode;
|
|
}
|
|
|
|
return $node;
|
|
}
|
|
|
|
/**
|
|
* @param DOMNode $startNode
|
|
* @param int $startOffset
|
|
* @param DOMNode $endNode
|
|
* @param int $endOffset
|
|
*/
|
|
public function __construct(
|
|
DOMNode $startNode, int $startOffset, DOMNode $endNode, int $endOffset
|
|
) {
|
|
$this->mStartContainer = $startNode;
|
|
$this->mStartOffset = $startOffset;
|
|
$this->mEndContainer = $endNode;
|
|
$this->mEndOffset = $endOffset;
|
|
}
|
|
|
|
/**
|
|
* @param string $field Field name
|
|
* @return mixed
|
|
*/
|
|
public function __get( string $field ) {
|
|
switch ( $field ) {
|
|
case 'collapsed':
|
|
return $this->mStartContainer === $this->mEndContainer &&
|
|
$this->mStartOffset === $this->mEndOffset;
|
|
case 'commonAncestorContainer':
|
|
if ( !$this->mCommonAncestorContainer ) {
|
|
$this->mCommonAncestorContainer =
|
|
self::findCommonAncestorContainer( $this->mStartContainer, $this->mEndContainer );
|
|
}
|
|
return $this->mCommonAncestorContainer;
|
|
case 'endContainer':
|
|
return $this->mEndContainer;
|
|
case 'endOffset':
|
|
return $this->mEndOffset;
|
|
case 'startContainer':
|
|
return $this->mStartContainer;
|
|
case 'startOffset':
|
|
return $this->mStartOffset;
|
|
default:
|
|
throw new Exception( 'Invalid property: ' . $field );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Clone range with a new start position
|
|
*
|
|
* @param DOMNode $startNode
|
|
* @param int $startOffset
|
|
* @return self
|
|
*/
|
|
public function setStart( DOMNode $startNode, int $startOffset ) : self {
|
|
return new self(
|
|
$startNode, $startOffset, $this->mEndContainer, $this->mEndOffset
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Clone range with a new end position
|
|
*
|
|
* @param DOMNode $endNode
|
|
* @param int $endOffset
|
|
* @return self
|
|
*/
|
|
public function setEnd( DOMNode $endNode, int $endOffset ) : self {
|
|
return new self(
|
|
$this->mStartContainer, $this->mStartOffset, $endNode, $endOffset
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Returns true if only a portion of the Node is contained within the Range.
|
|
*
|
|
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
|
* @see https://dom.spec.whatwg.org/#partially-contained
|
|
*
|
|
* @param DOMNode $node The Node to check against.
|
|
* @return bool
|
|
*/
|
|
private function isPartiallyContainedNode( DOMNode $node ) : bool {
|
|
$isAncestorOfStart = CommentUtils::contains( $node, $this->mStartContainer );
|
|
$isAncestorOfEnd = CommentUtils::contains( $node, $this->mEndContainer );
|
|
|
|
return ( $isAncestorOfStart && !$isAncestorOfEnd )
|
|
|| ( !$isAncestorOfStart && $isAncestorOfEnd );
|
|
}
|
|
|
|
/**
|
|
* Returns true if the entire Node is within the Range, otherwise false.
|
|
*
|
|
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
|
* @see https://dom.spec.whatwg.org/#contained
|
|
*
|
|
* @param DOMNode $node The Node to check against.
|
|
* @return bool
|
|
*/
|
|
private function isFullyContainedNode( DOMNode $node ) : bool {
|
|
$startBP = [ $this->mStartContainer, $this->mStartOffset ];
|
|
$endBP = [ $this->mEndContainer, $this->mEndOffset ];
|
|
$root = self::getRootNode( $this->mStartContainer );
|
|
|
|
return self::getRootNode( $node ) === $root
|
|
&& $this->computePosition( [ $node, 0 ], $startBP ) === 'after'
|
|
&& $this->computePosition(
|
|
[ $node, strlen( $node->nodeValue ) ],
|
|
$endBP
|
|
) === 'before';
|
|
}
|
|
|
|
/**
|
|
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
|
|
* @see https://dom.spec.whatwg.org/#dom-range-clonecontents
|
|
*
|
|
* @return DOMDocumentFragment
|
|
*/
|
|
public function cloneContents() : DOMDocumentFragment {
|
|
$ownerDocument = $this->mStartContainer->ownerDocument;
|
|
$fragment = $ownerDocument->createDocumentFragment();
|
|
|
|
if ( $this->mStartContainer === $this->mEndContainer
|
|
&& $this->mStartOffset === $this->mEndOffset
|
|
) {
|
|
return $fragment;
|
|
}
|
|
|
|
$originalStartContainer = $this->mStartContainer;
|
|
$originalStartOffset = $this->mStartOffset;
|
|
$originalEndContainer = $this->mEndContainer;
|
|
$originalEndOffset = $this->mEndOffset;
|
|
|
|
if ( $originalStartContainer === $originalEndContainer
|
|
&& ( $originalStartContainer instanceof DOMText
|
|
|| $originalStartContainer instanceof DOMProcessingInstruction
|
|
|| $originalStartContainer instanceof DOMComment )
|
|
) {
|
|
$clone = $originalStartContainer->cloneNode();
|
|
$clone->nodeValue = substr(
|
|
$originalStartContainer->nodeValue,
|
|
$originalStartOffset,
|
|
$originalEndOffset - $originalStartOffset
|
|
);
|
|
$fragment->appendChild( $clone );
|
|
|
|
return $fragment;
|
|
}
|
|
|
|
$commonAncestor = self::findCommonAncestorContainer(
|
|
$originalStartContainer,
|
|
$originalEndContainer
|
|
);
|
|
$firstPartiallyContainedChild = null;
|
|
|
|
if ( !CommentUtils::contains( $originalStartContainer, $originalEndContainer ) ) {
|
|
foreach ( $commonAncestor->childNodes as $node ) {
|
|
if ( $this->isPartiallyContainedNode( $node ) ) {
|
|
$firstPartiallyContainedChild = $node;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
$lastPartiallyContainedChild = null;
|
|
|
|
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 DOMDocumentType ) {
|
|
throw new Error();
|
|
}
|
|
}
|
|
|
|
if ( $firstPartiallyContainedChild instanceof DOMText
|
|
|| $firstPartiallyContainedChild instanceof DOMProcessingInstruction
|
|
|| $firstPartiallyContainedChild instanceof DOMComment
|
|
) {
|
|
$clone = $originalStartContainer->cloneNode();
|
|
$clone->nodeValue = substr(
|
|
$originalStartContainer->nodeValue,
|
|
$originalStartOffset,
|
|
strlen( $originalStartContainer->nodeValue ) - $originalStartOffset
|
|
);
|
|
$fragment->appendChild( $clone );
|
|
} elseif ( $firstPartiallyContainedChild ) {
|
|
$clone = $firstPartiallyContainedChild->cloneNode();
|
|
$fragment->appendChild( $clone );
|
|
$subrange = new self(
|
|
$originalStartContainer, $originalStartOffset,
|
|
$firstPartiallyContainedChild,
|
|
strlen( $firstPartiallyContainedChild->nodeValue )
|
|
);
|
|
$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 DOMText
|
|
|| $lastPartiallyContainedChild instanceof DOMProcessingInstruction
|
|
|| $lastPartiallyContainedChild instanceof DOMComment
|
|
) {
|
|
$clone = $originalEndContainer->cloneNode();
|
|
$clone->nodeValue = substr(
|
|
$originalEndContainer->nodeValue,
|
|
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 DOMNode $node The Node to be inserted.
|
|
* @return void
|
|
*/
|
|
public function insertNode( DOMNode $node ) : void {
|
|
if ( ( $this->mStartContainer instanceof DOMProcessingInstruction
|
|
|| $this->mStartContainer instanceof DOMComment )
|
|
|| ( $this->mStartContainer instanceof DOMText
|
|
&& $this->mStartContainer->parentNode === null )
|
|
) {
|
|
throw new Error();
|
|
}
|
|
|
|
$referenceNode = null;
|
|
|
|
if ( $this->mStartContainer instanceof DOMText ) {
|
|
$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 DOMText ) {
|
|
$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 );
|
|
//
|
|
// This should just be
|
|
// $parent->insertBefore( $node, $referenceNode );
|
|
// but the second argument is optional, not nullable
|
|
if ( $referenceNode ) {
|
|
$parent->insertBefore( $node, $referenceNode );
|
|
} else {
|
|
$parent->insertBefore( $node );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 mixed[] $boundaryPointA An array containing a Node and an offset within that Node representing a boundary.
|
|
* @param mixed[] $boundaryPointB An array containing a Node and an offset within that Node representing a boundary.
|
|
* @return string Returns before, equal, or after based on the position of the first boundary relative to the second
|
|
* boundary.
|
|
*/
|
|
private function computePosition(
|
|
array $boundaryPointA,
|
|
array $boundaryPointB
|
|
) : string {
|
|
if ( $boundaryPointA[0] === $boundaryPointB[0] ) {
|
|
if ( $boundaryPointA[1] === $boundaryPointB[1] ) {
|
|
return 'equal';
|
|
} elseif ( $boundaryPointA[1] < $boundaryPointB[1] ) {
|
|
return 'before';
|
|
} else {
|
|
return 'after';
|
|
}
|
|
}
|
|
|
|
$commonAncestor = $this->findCommonAncestorContainer( $boundaryPointB[0], $boundaryPointA[0] );
|
|
if ( $commonAncestor === $boundaryPointA[0] ) {
|
|
$AFollowsB = false;
|
|
} elseif ( $commonAncestor === $boundaryPointB[0] ) {
|
|
$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 = $boundaryPointB[0];
|
|
while ( $b->parentNode !== $commonAncestor ) {
|
|
$b = $b->parentNode;
|
|
}
|
|
$a = $boundaryPointA[0];
|
|
while ( $a->parentNode !== $commonAncestor ) {
|
|
$a = $a->parentNode;
|
|
}
|
|
$AFollowsB = false;
|
|
while ( $b ) {
|
|
if ( $a === $b ) {
|
|
$AFollowsB = true;
|
|
break;
|
|
}
|
|
$b = $b->nextSibling;
|
|
}
|
|
}
|
|
|
|
if ( $AFollowsB ) {
|
|
// Swap variables
|
|
[ $boundaryPointB, $boundaryPointA ] = [ $boundaryPointA, $boundaryPointB ];
|
|
}
|
|
|
|
$ancestor = $boundaryPointB[0]->parentNode;
|
|
|
|
while ( $ancestor ) {
|
|
if ( $ancestor === $boundaryPointA[0] ) {
|
|
break;
|
|
}
|
|
|
|
$ancestor = $ancestor->parentNode;
|
|
}
|
|
|
|
if ( $ancestor ) {
|
|
$child = $boundaryPointB[0];
|
|
|
|
while ( $child ) {
|
|
if ( $child->parentNode === $boundaryPointA[0] ) {
|
|
break;
|
|
}
|
|
|
|
$child = $child->parentNode;
|
|
}
|
|
|
|
if ( CommentUtils::childIndexOf( $child ) < $boundaryPointA[1] ) {
|
|
return $AFollowsB ? 'before' : 'after';
|
|
}
|
|
}
|
|
|
|
return $AFollowsB ? 'after' : 'before';
|
|
}
|
|
|
|
}
|