mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-13 18:37:07 +00:00
c781b127c9
* Ignore rendering-transparent nodes between discussion comments.
* Improve isRenderingTransparentNode() so that <link> nodes
representing TemplateStyles are not considered transparent,
otherwise this would undo ae920b831f.
Using a regexp from Parsoid.
Bug: T272746
Change-Id: I0b3c3251156ba6c4826abf5ba44ea93f80ebc01d
475 lines
13 KiB
PHP
475 lines
13 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use DOMComment;
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use DOMElement;
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use DOMNode;
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use DOMXPath;
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use MediaWiki\MediaWikiServices;
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use Title;
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use Wikimedia\Parsoid\Utils\DOMCompat;
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class CommentUtils {
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private function __construct() {
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}
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private static $blockElementTypes = [
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'div', 'p',
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// Tables
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'table', 'tbody', 'thead', 'tfoot', 'caption', 'th', 'tr', 'td',
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// Lists
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'ul', 'ol', 'li', 'dl', 'dt', 'dd',
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// HTML5 heading content
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'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hgroup',
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// HTML5 sectioning content
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'article', 'aside', 'body', 'nav', 'section', 'footer', 'header', 'figure',
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'figcaption', 'fieldset', 'details', 'blockquote',
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// Other
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'hr', 'button', 'canvas', 'center', 'col', 'colgroup', 'embed',
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'map', 'object', 'pre', 'progress', 'video'
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];
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/**
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* @param DOMNode $node
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* @return bool Node is a block element
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*/
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public static function isBlockElement( DOMNode $node ) : bool {
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return $node instanceof DOMElement &&
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in_array( strtolower( $node->tagName ), self::$blockElementTypes );
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}
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private const SOL_TRANSPARENT_LINK_REGEX =
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'/(?:^|\s)mw:PageProp\/(?:Category|redirect|Language)(?=$|\s)/D';
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/**
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* @param DOMNode $node
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* @return bool Node is considered a rendering-transparent node in Parsoid
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*/
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public static function isRenderingTransparentNode( DOMNode $node ) : bool {
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return (
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$node instanceof DOMComment ||
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$node instanceof DOMElement && (
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strtolower( $node->tagName ) === 'meta' ||
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(
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strtolower( $node->tagName ) === 'link' &&
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preg_match( self::SOL_TRANSPARENT_LINK_REGEX, $node->getAttribute( 'rel' ) ?? '' )
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) ||
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// Empty inline templates, e.g. tracking templates
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(
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strtolower( $node->tagName ) === 'span' &&
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in_array( 'mw:Transclusion', explode( ' ', $node->getAttribute( 'typeof' ) ?? '' ) ) &&
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!self::htmlTrim( DOMCompat::getInnerHTML( $node ) )
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)
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)
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);
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}
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/**
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* Elements which can't have element children (but some may have text content).
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* https://html.spec.whatwg.org/#elements-2
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* @var string[]
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*/
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private static $noElementChildrenElementTypes = [
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// Void elements
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'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input',
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'link', 'meta', 'param', 'source', 'track', 'wbr',
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// Raw text elements
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'script', 'style',
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// Escapable raw text elements
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'textarea', 'title',
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];
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/**
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* @param DOMNode $node
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* @return bool If true, node can't have element children. If false, it's complicated.
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*/
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public static function cantHaveElementChildren( DOMNode $node ) : bool {
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return (
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$node instanceof DOMComment ||
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$node instanceof DOMElement &&
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in_array( strtolower( $node->tagName ), self::$noElementChildrenElementTypes )
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);
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}
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/**
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* Get the index of $child in its parent
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*
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* @param DOMNode $child
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* @return int
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*/
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public static function childIndexOf( DOMNode $child ) : int {
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$i = 0;
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while ( ( $child = $child->previousSibling ) ) {
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$i++;
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}
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return $i;
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}
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/**
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* Check whether a DOMNode contains (is an ancestor of) another DOMNode (or is the same node)
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*
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* @param DOMNode $ancestor
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* @param DOMNode $descendant
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* @return bool
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*/
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public static function contains( DOMNode $ancestor, DOMNode $descendant ) : bool {
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// TODO can we use DOMNode->compareDocumentPosition() here maybe?
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$node = $descendant;
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while ( $node && $node !== $ancestor ) {
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$node = $node->parentNode;
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}
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return $node === $ancestor;
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}
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/**
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* Find closest ancestor element using one of the given tag names.
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*
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* @param DOMNode $node
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* @param string[] $tagNames
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* @return DOMElement|null
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*/
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public static function closestElement( DOMNode $node, array $tagNames ) : ?DOMElement {
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do {
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if (
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$node->nodeType === XML_ELEMENT_NODE &&
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in_array( strtolower( $node->nodeName ), $tagNames )
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) {
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return $node;
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}
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$node = $node->parentNode;
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} while ( $node );
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return null;
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}
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/**
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* Find the transclusion node which rendered the current node, if it exists.
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*
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* 1. Find the closest ancestor with an 'about' attribute
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* 2. Find the main node of the about-group (first sibling with the same 'about' attribute)
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* 3. If this is an mw:Transclusion node, return it; otherwise, go to step 1
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*
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* @param DOMNode $node
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* @return DOMElement|null Translcusion node, null if not found
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*/
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public static function getTranscludedFromElement( DOMNode $node ) : ?DOMElement {
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while ( $node ) {
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// 1.
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if (
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$node instanceof DOMElement &&
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$node->getAttribute( 'about' ) &&
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preg_match( '/^#mwt\d+$/', $node->getAttribute( 'about' ) )
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) {
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$about = $node->getAttribute( 'about' );
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// 2.
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while (
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( $previousSibling = $node->previousSibling ) &&
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$previousSibling instanceof DOMElement &&
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$previousSibling->getAttribute( 'about' ) === $about
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) {
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$node = $previousSibling;
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}
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// 3.
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if (
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$node->getAttribute( 'typeof' ) &&
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in_array( 'mw:Transclusion', explode( ' ', $node->getAttribute( 'typeof' ) ) )
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) {
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break;
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}
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}
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$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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* Given a heading node, return the node on which the ID attribute is set.
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*
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* Also returns the offset within that node where the heading text starts.
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*
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* @param DOMElement $heading Heading node (`<h1>`-`<h6>`)
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* @return array Array containing a 'node' (DOMElement) and offset (int)
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*/
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public static function getHeadlineNodeAndOffset( DOMElement $heading ) : array {
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// This code assumes that $wgFragmentMode is [ 'html5', 'legacy' ] or [ 'html5' ]
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$headline = $heading;
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$offset = 0;
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if ( $headline->getAttribute( 'data-mw-comment-start' ) ) {
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$headline = $headline->parentNode;
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}
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if ( !$headline->getAttribute( 'id' ) ) {
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// PHP HTML: Find the child with .mw-headline
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$headline = $headline->firstChild;
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while (
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$headline && !(
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$headline instanceof DOMElement && $headline->getAttribute( 'class' ) === 'mw-headline'
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)
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) {
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$headline = $headline->nextSibling;
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}
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if ( $headline ) {
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if (
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( $firstChild = $headline->firstChild ) instanceof DOMElement &&
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$firstChild->getAttribute( 'class' ) === 'mw-headline-number'
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) {
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$offset = 1;
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}
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} else {
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$headline = $heading;
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}
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}
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return [
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'node' => $headline,
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'offset' => $offset,
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];
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}
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/**
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* Trim ASCII whitespace, as defined in the HTML spec.
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*
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* @param string $str
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* @return string
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*/
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public static function htmlTrim( string $str ) : string {
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// https://infra.spec.whatwg.org/#ascii-whitespace
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return trim( $str, "\t\n\f\r " );
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}
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/**
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* Get the indent level of $node, relative to $rootNode.
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*
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* The indent level is the number of lists inside of which it is nested.
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*
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* @param DOMNode $node
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* @param DOMNode $rootNode
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* @return int
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*/
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public static function getIndentLevel( DOMNode $node, DOMNode $rootNode ) : int {
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$indent = 0;
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while ( $node ) {
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if ( $node === $rootNode ) {
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break;
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}
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$nodeName = strtolower( $node->nodeName );
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if ( $nodeName === 'li' || $nodeName === 'dd' ) {
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$indent++;
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}
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$node = $node->parentNode;
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}
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return $indent;
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}
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/**
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* Get an array of sibling nodes that contain parts of the given thread item.
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*
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* @param ThreadItem $item
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* @return DOMElement[]
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*/
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private static function getCoveredSiblings( ThreadItem $item ) : array {
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$range = $item->getRange();
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$ancestor = $range->commonAncestorContainer;
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if ( $ancestor === $range->startContainer || $ancestor === $range->endContainer ) {
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return [ $ancestor ];
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}
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// Convert to array early because apparently DOMNodeList acts like a linked list
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// and accessing items by index is slow
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$siblings = iterator_to_array( $ancestor->childNodes );
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$start = 0;
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$end = count( $siblings ) - 1;
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// Find first of the siblings that contains the item
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while ( !self::contains( $siblings[ $start ], $range->startContainer ) ) {
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$start++;
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}
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// Find last of the siblings that contains the item
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while ( !self::contains( $siblings[ $end ], $range->endContainer ) ) {
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$end--;
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}
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return array_slice( $siblings, $start, $end - $start + 1 );
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}
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/**
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* Get the nodes (if any) that contain the given thread item, and nothing else.
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*
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* @param ThreadItem $item
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* @return DOMElement[]|null
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*/
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public static function getFullyCoveredSiblings( ThreadItem $item ) : ?array {
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$siblings = self::getCoveredSiblings( $item );
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$isIgnored = function ( $node ) {
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// Ignore empty text nodes
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return $node->nodeType === XML_TEXT_NODE && CommentUtils::htmlTrim( $node->nodeValue ) === '';
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};
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$isFirstNonemptyChild = function ( $node ) use ( $isIgnored ) {
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while ( ( $node = $node->previousSibling ) ) {
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if ( !$isIgnored( $node ) ) {
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return false;
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}
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}
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return true;
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};
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$isLastNonemptyChild = function ( $node ) use ( $isIgnored ) {
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while ( ( $node = $node->nextSibling ) ) {
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if ( !$isIgnored( $node ) ) {
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return false;
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}
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}
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return true;
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};
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$startMatches = false;
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$node = $siblings[ 0 ];
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while ( $node ) {
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if ( $item->getRange()->startContainer === $node && $item->getRange()->startOffset === 0 ) {
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$startMatches = true;
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break;
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}
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if ( $isIgnored( $node ) ) {
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$node = $node->nextSibling;
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} else {
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$node = $node->firstChild;
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}
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}
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$endMatches = false;
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$node = end( $siblings );
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while ( $node ) {
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$length = ( $node->nodeType === XML_TEXT_NODE ) ?
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strlen( rtrim( $node->nodeValue, "\t\n\f\r " ) ) :
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// PHP bug: childNodes can be null for comment nodes
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// (it should always be a DOMNodeList, even if the node can't have children)
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( $node->childNodes ? $node->childNodes->length : 0 );
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if ( $item->getRange()->endContainer === $node && $item->getRange()->endOffset === $length ) {
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$endMatches = true;
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break;
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}
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if ( $isIgnored( $node ) ) {
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$node = $node->previousSibling;
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} else {
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$node = $node->lastChild;
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}
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}
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if ( $startMatches && $endMatches ) {
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// If these are all of the children (or the only child), go up one more level
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while (
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( $parent = $siblings[ 0 ]->parentNode ) &&
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$isFirstNonemptyChild( $siblings[ 0 ] ) &&
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$isLastNonemptyChild( end( $siblings ) )
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) {
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$siblings = [ $parent ];
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}
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return $siblings;
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}
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return null;
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}
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/**
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* Unwrap Parsoid sections
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*
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* @param DOMElement $element Parent element, e.g. document body
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* @param string|null $keepSection Section to keep
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*/
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public static function unwrapParsoidSections(
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DOMElement $element, string $keepSection = null
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) : void {
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$xpath = new DOMXPath( $element->ownerDocument );
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$sections = $xpath->query( '//section[@data-mw-section-id]', $element );
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foreach ( $sections as $section ) {
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$parent = $section->parentNode;
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$sectionId = $section->getAttribute( 'data-mw-section-id' );
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// Copy section ID to first child (should be a heading)
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if ( $sectionId !== '' && intval( $sectionId ) > 0 ) {
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$section->firstChild->setAttribute( 'data-mw-section-id', $sectionId );
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}
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if ( $keepSection !== null && $sectionId === $keepSection ) {
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return;
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}
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while ( $section->firstChild ) {
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$parent->insertBefore( $section->firstChild, $section );
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}
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$parent->removeChild( $section );
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}
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}
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/**
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* Get a MediaWiki page title from a URL
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*
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* @param string $url
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* @return Title|null
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*/
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public static function getTitleFromUrl( string $url ) : ?Title {
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$bits = parse_url( $url );
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$query = wfCgiToArray( $bits['query'] ?? '' );
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if ( isset( $query['title'] ) ) {
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return Title::newFromText( $query['title'] );
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}
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$config = MediaWikiServices::getInstance()->getMainConfig();
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// TODO: Set the correct base in the document?
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if ( strpos( $url, './' ) === 0 ) {
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$url = 'https://local' . str_replace( '$1', substr( $url, 2 ), $config->get( 'ArticlePath' ) );
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} elseif ( strpos( $url, '://' ) === false ) {
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$url = 'https://local' . $url;
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}
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$articlePathRegexp = '/' . str_replace(
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preg_quote( '$1', '/' ),
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'(.*)',
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preg_quote( $config->get( 'ArticlePath' ), '/' )
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) . '/';
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$matches = null;
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if ( preg_match( $articlePathRegexp, $url, $matches ) ) {
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return Title::newFromText( urldecode( $matches[1] ) );
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}
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return null;
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}
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/**
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* Traverse the document in depth-first order, calling the callback whenever entering and leaving
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* a node. The walk starts before the given node and ends when callback returns a truthy value, or
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* after reaching the end of the document.
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*
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* You might also think about this as processing XML token stream linearly (rather than XML
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* nodes), as if we were parsing the document.
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*
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* @param DOMNode $node Node to start at
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* @param callable $callback Function accepting two arguments: $event ('enter' or 'leave') and
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* $node (DOMNode)
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* @return mixed Final return value of the callback
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*/
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public static function linearWalk( DOMNode $node, callable $callback ) {
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$result = null;
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[ $withinNode, $beforeNode ] = [ $node->parentNode, $node ];
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while ( $beforeNode || $withinNode ) {
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if ( $beforeNode ) {
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$result = $callback( 'enter', $beforeNode );
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[ $withinNode, $beforeNode ] = [ $beforeNode, $beforeNode->firstChild ];
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} else {
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$result = $callback( 'leave', $withinNode );
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[ $withinNode, $beforeNode ] = [ $withinNode->parentNode, $withinNode->nextSibling ];
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}
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if ( $result ) {
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return $result;
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}
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}
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return $result;
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}
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}
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