mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-28 18:21:50 +00:00
6e37a172ae
As a result of 0fc71f60cd, "empty" text
nodes (containing only whitespace) at the end of the comment may be
inside the comment's range, and trying to ignore them caused the
ranges not to match and the frame not to be detected.
Now the code works whether they're inside the comment's range or not.
Add a test case for wrapped discussion comments with HTML comments and
with whitespace.
Bug: T250126
Bug: T268407
Change-Id: I2217ff5a635fd1c9c9e803f46795b1bfb3d17535
436 lines
12 KiB
PHP
436 lines
12 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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/**
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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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strtolower( $node->tagName ) === 'link' ||
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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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