mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-12-18 02:51:26 +00:00
518 lines
14 KiB
PHP
518 lines
14 KiB
PHP
<?php
|
|
|
|
namespace MediaWiki\Extension\DiscussionTools;
|
|
|
|
use DOMComment;
|
|
use DOMElement;
|
|
use DOMNode;
|
|
use DOMXPath;
|
|
use MediaWiki\MediaWikiServices;
|
|
use Title;
|
|
use Wikimedia\Parsoid\Utils\DOMCompat;
|
|
|
|
class CommentUtils {
|
|
private function __construct() {
|
|
}
|
|
|
|
private static $blockElementTypes = [
|
|
'div', 'p',
|
|
// Tables
|
|
'table', 'tbody', 'thead', 'tfoot', 'caption', 'th', 'tr', 'td',
|
|
// Lists
|
|
'ul', 'ol', 'li', 'dl', 'dt', 'dd',
|
|
// HTML5 heading content
|
|
'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hgroup',
|
|
// HTML5 sectioning content
|
|
'article', 'aside', 'body', 'nav', 'section', 'footer', 'header', 'figure',
|
|
'figcaption', 'fieldset', 'details', 'blockquote',
|
|
// Other
|
|
'hr', 'button', 'canvas', 'center', 'col', 'colgroup', 'embed',
|
|
'map', 'object', 'pre', 'progress', 'video'
|
|
];
|
|
|
|
/**
|
|
* @param DOMNode $node
|
|
* @return bool Node is a block element
|
|
*/
|
|
public static function isBlockElement( DOMNode $node ) : bool {
|
|
return $node instanceof DOMElement &&
|
|
in_array( strtolower( $node->tagName ), self::$blockElementTypes );
|
|
}
|
|
|
|
private const SOL_TRANSPARENT_LINK_REGEX =
|
|
'/(?:^|\s)mw:PageProp\/(?:Category|redirect|Language)(?=$|\s)/D';
|
|
|
|
/**
|
|
* @param DOMNode $node
|
|
* @return bool Node is considered a rendering-transparent node in Parsoid
|
|
*/
|
|
public static function isRenderingTransparentNode( DOMNode $node ) : bool {
|
|
return (
|
|
$node instanceof DOMComment ||
|
|
$node instanceof DOMElement && (
|
|
strtolower( $node->tagName ) === 'meta' ||
|
|
(
|
|
strtolower( $node->tagName ) === 'link' &&
|
|
preg_match( self::SOL_TRANSPARENT_LINK_REGEX, $node->getAttribute( 'rel' ) ?? '' )
|
|
) ||
|
|
// Empty inline templates, e.g. tracking templates
|
|
(
|
|
strtolower( $node->tagName ) === 'span' &&
|
|
in_array( 'mw:Transclusion', explode( ' ', $node->getAttribute( 'typeof' ) ?? '' ) ) &&
|
|
!self::htmlTrim( DOMCompat::getInnerHTML( $node ) )
|
|
)
|
|
)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Elements which can't have element children (but some may have text content).
|
|
* https://html.spec.whatwg.org/#elements-2
|
|
* @var string[]
|
|
*/
|
|
private static $noElementChildrenElementTypes = [
|
|
// Void elements
|
|
'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input',
|
|
'link', 'meta', 'param', 'source', 'track', 'wbr',
|
|
// Raw text elements
|
|
'script', 'style',
|
|
// Escapable raw text elements
|
|
'textarea', 'title',
|
|
// Treated like text when scripting is enabled in the parser
|
|
// https://html.spec.whatwg.org/#the-noscript-element
|
|
'noscript',
|
|
];
|
|
|
|
/**
|
|
* @param DOMNode $node
|
|
* @return bool If true, node can't have element children. If false, it's complicated.
|
|
*/
|
|
public static function cantHaveElementChildren( DOMNode $node ) : bool {
|
|
return (
|
|
$node instanceof DOMComment ||
|
|
$node instanceof DOMElement &&
|
|
in_array( strtolower( $node->tagName ), self::$noElementChildrenElementTypes )
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Get the index of $child in its parent
|
|
*
|
|
* @param DOMNode $child
|
|
* @return int
|
|
*/
|
|
public static function childIndexOf( DOMNode $child ) : int {
|
|
$i = 0;
|
|
while ( ( $child = $child->previousSibling ) ) {
|
|
$i++;
|
|
}
|
|
return $i;
|
|
}
|
|
|
|
/**
|
|
* Check whether a DOMNode contains (is an ancestor of) another DOMNode (or is the same node)
|
|
*
|
|
* @param DOMNode $ancestor
|
|
* @param DOMNode $descendant
|
|
* @return bool
|
|
*/
|
|
public static function contains( DOMNode $ancestor, DOMNode $descendant ) : bool {
|
|
// TODO can we use DOMNode->compareDocumentPosition() here maybe?
|
|
$node = $descendant;
|
|
while ( $node && $node !== $ancestor ) {
|
|
$node = $node->parentNode;
|
|
}
|
|
return $node === $ancestor;
|
|
}
|
|
|
|
/**
|
|
* Find closest ancestor element using one of the given tag names.
|
|
*
|
|
* @param DOMNode $node
|
|
* @param string[] $tagNames
|
|
* @return DOMElement|null
|
|
*/
|
|
public static function closestElement( DOMNode $node, array $tagNames ) : ?DOMElement {
|
|
do {
|
|
if (
|
|
$node->nodeType === XML_ELEMENT_NODE &&
|
|
in_array( strtolower( $node->nodeName ), $tagNames )
|
|
) {
|
|
return $node;
|
|
}
|
|
$node = $node->parentNode;
|
|
} while ( $node );
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Find the transclusion node which rendered the current node, if it exists.
|
|
*
|
|
* 1. Find the closest ancestor with an 'about' attribute
|
|
* 2. Find the main node of the about-group (first sibling with the same 'about' attribute)
|
|
* 3. If this is an mw:Transclusion node, return it; otherwise, go to step 1
|
|
*
|
|
* @param DOMNode $node
|
|
* @return DOMElement|null Translcusion node, null if not found
|
|
*/
|
|
public static function getTranscludedFromElement( DOMNode $node ) : ?DOMElement {
|
|
while ( $node ) {
|
|
// 1.
|
|
if (
|
|
$node instanceof DOMElement &&
|
|
$node->getAttribute( 'about' ) &&
|
|
preg_match( '/^#mwt\d+$/', $node->getAttribute( 'about' ) )
|
|
) {
|
|
$about = $node->getAttribute( 'about' );
|
|
|
|
// 2.
|
|
while (
|
|
( $previousSibling = $node->previousSibling ) &&
|
|
$previousSibling instanceof DOMElement &&
|
|
$previousSibling->getAttribute( 'about' ) === $about
|
|
) {
|
|
$node = $previousSibling;
|
|
}
|
|
|
|
// 3.
|
|
if (
|
|
$node->getAttribute( 'typeof' ) &&
|
|
in_array( 'mw:Transclusion', explode( ' ', $node->getAttribute( 'typeof' ) ) )
|
|
) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
$node = $node->parentNode;
|
|
}
|
|
return $node;
|
|
}
|
|
|
|
/**
|
|
* Given a heading node, return the node on which the ID attribute is set.
|
|
*
|
|
* Also returns the offset within that node where the heading text starts.
|
|
*
|
|
* @param DOMElement $heading Heading node (`<h1>`-`<h6>`)
|
|
* @return array Array containing a 'node' (DOMElement) and offset (int)
|
|
*/
|
|
public static function getHeadlineNodeAndOffset( DOMElement $heading ) : array {
|
|
// This code assumes that $wgFragmentMode is [ 'html5', 'legacy' ] or [ 'html5' ]
|
|
$headline = $heading;
|
|
$offset = 0;
|
|
|
|
if ( $headline->hasAttribute( 'data-mw-comment-start' ) ) {
|
|
$headline = $headline->parentNode;
|
|
}
|
|
|
|
if ( !$headline->getAttribute( 'id' ) ) {
|
|
// PHP HTML: Find the child with .mw-headline
|
|
$headline = $headline->firstChild;
|
|
while (
|
|
$headline && !(
|
|
$headline instanceof DOMElement && $headline->getAttribute( 'class' ) === 'mw-headline'
|
|
)
|
|
) {
|
|
$headline = $headline->nextSibling;
|
|
}
|
|
if ( $headline ) {
|
|
if (
|
|
( $firstChild = $headline->firstChild ) instanceof DOMElement &&
|
|
$firstChild->getAttribute( 'class' ) === 'mw-headline-number'
|
|
) {
|
|
$offset = 1;
|
|
}
|
|
} else {
|
|
$headline = $heading;
|
|
}
|
|
}
|
|
|
|
return [
|
|
'node' => $headline,
|
|
'offset' => $offset,
|
|
];
|
|
}
|
|
|
|
/**
|
|
* Trim ASCII whitespace, as defined in the HTML spec.
|
|
*
|
|
* @param string $str
|
|
* @return string
|
|
*/
|
|
public static function htmlTrim( string $str ) : string {
|
|
// https://infra.spec.whatwg.org/#ascii-whitespace
|
|
return trim( $str, "\t\n\f\r " );
|
|
}
|
|
|
|
/**
|
|
* Get the indent level of $node, relative to $rootNode.
|
|
*
|
|
* The indent level is the number of lists inside of which it is nested.
|
|
*
|
|
* @param DOMNode $node
|
|
* @param DOMNode $rootNode
|
|
* @return int
|
|
*/
|
|
public static function getIndentLevel( DOMNode $node, DOMNode $rootNode ) : int {
|
|
$indent = 0;
|
|
while ( $node ) {
|
|
if ( $node === $rootNode ) {
|
|
break;
|
|
}
|
|
$nodeName = strtolower( $node->nodeName );
|
|
if ( $nodeName === 'li' || $nodeName === 'dd' ) {
|
|
$indent++;
|
|
}
|
|
$node = $node->parentNode;
|
|
}
|
|
return $indent;
|
|
}
|
|
|
|
/**
|
|
* Get an array of sibling nodes that contain parts of the given range.
|
|
*
|
|
* @param ImmutableRange $range
|
|
* @return DOMElement[]
|
|
*/
|
|
public static function getCoveredSiblings( ImmutableRange $range ) : array {
|
|
$ancestor = $range->commonAncestorContainer;
|
|
|
|
// Convert to array early because apparently DOMNodeList acts like a linked list
|
|
// and accessing items by index is slow
|
|
$siblings = iterator_to_array( $ancestor->childNodes );
|
|
$start = 0;
|
|
$end = count( $siblings ) - 1;
|
|
|
|
// Find first of the siblings that contains the item
|
|
if ( $ancestor === $range->startContainer ) {
|
|
$start = $range->startOffset;
|
|
} else {
|
|
while ( !self::contains( $siblings[ $start ], $range->startContainer ) ) {
|
|
$start++;
|
|
}
|
|
}
|
|
|
|
// Find last of the siblings that contains the item
|
|
if ( $ancestor === $range->endContainer ) {
|
|
$end = $range->endOffset - 1;
|
|
} else {
|
|
while ( !self::contains( $siblings[ $end ], $range->endContainer ) ) {
|
|
$end--;
|
|
}
|
|
}
|
|
|
|
return array_slice( $siblings, $start, $end - $start + 1 );
|
|
}
|
|
|
|
/**
|
|
* Get the nodes (if any) that contain the given thread item, and nothing else.
|
|
*
|
|
* @param ThreadItem $item
|
|
* @return DOMElement[]|null
|
|
*/
|
|
public static function getFullyCoveredSiblings( ThreadItem $item ) : ?array {
|
|
$siblings = self::getCoveredSiblings( $item->getRange() );
|
|
$startContainer = $item->getRange()->startContainer;
|
|
$endContainer = $item->getRange()->endContainer;
|
|
$startOffset = $item->getRange()->startOffset;
|
|
$endOffset = $item->getRange()->endOffset;
|
|
|
|
$isIgnored = function ( $node ) {
|
|
// Ignore empty text nodes
|
|
return $node->nodeType === XML_TEXT_NODE && CommentUtils::htmlTrim( $node->nodeValue ) === '';
|
|
};
|
|
|
|
$isFirstNonemptyChild = function ( $node ) use ( $isIgnored ) {
|
|
while ( ( $node = $node->previousSibling ) ) {
|
|
if ( !$isIgnored( $node ) ) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
};
|
|
|
|
$isLastNonemptyChild = function ( $node ) use ( $isIgnored ) {
|
|
while ( ( $node = $node->nextSibling ) ) {
|
|
if ( !$isIgnored( $node ) ) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
};
|
|
|
|
$startMatches = false;
|
|
$node = $siblings[ 0 ] ?? null;
|
|
while ( $node ) {
|
|
if ( $startContainer->childNodes && $startContainer->childNodes[ $startOffset ] === $node ) {
|
|
$startMatches = true;
|
|
break;
|
|
}
|
|
if ( $startContainer === $node && $startOffset === 0 ) {
|
|
$startMatches = true;
|
|
break;
|
|
}
|
|
if ( $isIgnored( $node ) ) {
|
|
$node = $node->nextSibling;
|
|
} else {
|
|
$node = $node->firstChild;
|
|
}
|
|
}
|
|
|
|
$endMatches = false;
|
|
$node = end( $siblings );
|
|
while ( $node ) {
|
|
if ( $endContainer->childNodes && $endContainer->childNodes[ $endOffset - 1 ] === $node ) {
|
|
$endMatches = true;
|
|
break;
|
|
}
|
|
$length = ( $node->nodeType === XML_TEXT_NODE ) ?
|
|
strlen( rtrim( $node->nodeValue, "\t\n\f\r " ) ) :
|
|
// PHP bug: childNodes can be null for comment nodes
|
|
// (it should always be a DOMNodeList, even if the node can't have children)
|
|
( $node->childNodes ? $node->childNodes->length : 0 );
|
|
if ( $endContainer === $node && $endOffset === $length ) {
|
|
$endMatches = true;
|
|
break;
|
|
}
|
|
if ( $isIgnored( $node ) ) {
|
|
$node = $node->previousSibling;
|
|
} else {
|
|
$node = $node->lastChild;
|
|
}
|
|
}
|
|
|
|
if ( $startMatches && $endMatches ) {
|
|
// If these are all of the children (or the only child), go up one more level
|
|
while (
|
|
( $parent = $siblings[ 0 ]->parentNode ) &&
|
|
$isFirstNonemptyChild( $siblings[ 0 ] ) &&
|
|
$isLastNonemptyChild( end( $siblings ) )
|
|
) {
|
|
$siblings = [ $parent ];
|
|
}
|
|
return $siblings;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Unwrap Parsoid sections
|
|
*
|
|
* @param DOMElement $element Parent element, e.g. document body
|
|
* @param string|null $keepSection Section to keep
|
|
*/
|
|
public static function unwrapParsoidSections(
|
|
DOMElement $element, string $keepSection = null
|
|
) : void {
|
|
$xpath = new DOMXPath( $element->ownerDocument );
|
|
$sections = $xpath->query( '//section[@data-mw-section-id]', $element );
|
|
foreach ( $sections as $section ) {
|
|
$parent = $section->parentNode;
|
|
$sectionId = $section->getAttribute( 'data-mw-section-id' );
|
|
// Copy section ID to first child (should be a heading)
|
|
if ( $sectionId !== '' && intval( $sectionId ) > 0 ) {
|
|
$section->firstChild->setAttribute( 'data-mw-section-id', $sectionId );
|
|
}
|
|
if ( $keepSection !== null && $sectionId === $keepSection ) {
|
|
return;
|
|
}
|
|
while ( $section->firstChild ) {
|
|
$parent->insertBefore( $section->firstChild, $section );
|
|
}
|
|
$parent->removeChild( $section );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get a MediaWiki page title from a URL
|
|
*
|
|
* @param string $url
|
|
* @return Title|null
|
|
*/
|
|
public static function getTitleFromUrl( string $url ) : ?Title {
|
|
$bits = parse_url( $url );
|
|
$query = wfCgiToArray( $bits['query'] ?? '' );
|
|
if ( isset( $query['title'] ) ) {
|
|
return Title::newFromText( $query['title'] );
|
|
}
|
|
|
|
$config = MediaWikiServices::getInstance()->getMainConfig();
|
|
// TODO: Set the correct base in the document?
|
|
if ( strpos( $url, './' ) === 0 ) {
|
|
$url = 'https://local' . str_replace( '$1', substr( $url, 2 ), $config->get( 'ArticlePath' ) );
|
|
} elseif ( strpos( $url, '://' ) === false ) {
|
|
$url = 'https://local' . $url;
|
|
}
|
|
|
|
$articlePathRegexp = '/' . str_replace(
|
|
preg_quote( '$1', '/' ),
|
|
'(.*)',
|
|
preg_quote( $config->get( 'ArticlePath' ), '/' )
|
|
) . '/';
|
|
$matches = null;
|
|
if ( preg_match( $articlePathRegexp, $url, $matches ) ) {
|
|
return Title::newFromText( urldecode( $matches[1] ) );
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Traverse the document in depth-first order, calling the callback whenever entering and leaving
|
|
* a node. The walk starts before the given node and ends when callback returns a truthy value, or
|
|
* after reaching the end of the document.
|
|
*
|
|
* You might also think about this as processing XML token stream linearly (rather than XML
|
|
* nodes), as if we were parsing the document.
|
|
*
|
|
* @param DOMNode $node Node to start at
|
|
* @param callable $callback Function accepting two arguments: $event ('enter' or 'leave') and
|
|
* $node (DOMNode)
|
|
* @return mixed Final return value of the callback
|
|
*/
|
|
public static function linearWalk( DOMNode $node, callable $callback ) {
|
|
$result = null;
|
|
[ $withinNode, $beforeNode ] = [ $node->parentNode, $node ];
|
|
|
|
while ( $beforeNode || $withinNode ) {
|
|
if ( $beforeNode ) {
|
|
$result = $callback( 'enter', $beforeNode );
|
|
[ $withinNode, $beforeNode ] = [ $beforeNode, $beforeNode->firstChild ];
|
|
} else {
|
|
$result = $callback( 'leave', $withinNode );
|
|
[ $withinNode, $beforeNode ] = [ $withinNode->parentNode, $withinNode->nextSibling ];
|
|
}
|
|
|
|
if ( $result ) {
|
|
return $result;
|
|
}
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Like #linearWalk, but it goes backwards.
|
|
*
|
|
* @inheritDoc ::linearWalk()
|
|
*/
|
|
public static function linearWalkBackwards( DOMNode $node, callable $callback ) {
|
|
$result = null;
|
|
[ $withinNode, $beforeNode ] = [ $node->parentNode, $node ];
|
|
|
|
while ( $beforeNode || $withinNode ) {
|
|
if ( $beforeNode ) {
|
|
$result = $callback( 'enter', $beforeNode );
|
|
[ $withinNode, $beforeNode ] = [ $beforeNode, $beforeNode->lastChild ];
|
|
} else {
|
|
$result = $callback( 'leave', $withinNode );
|
|
[ $withinNode, $beforeNode ] = [ $withinNode->parentNode, $withinNode->previousSibling ];
|
|
}
|
|
|
|
if ( $result ) {
|
|
return $result;
|
|
}
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
}
|