mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-28 18:21:50 +00:00
498 lines
16 KiB
PHP
498 lines
16 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use DOMComment;
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use DOMDocument;
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use DOMElement;
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use DOMNode;
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use DOMText;
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use DOMXPath;
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use Wikimedia\Parsoid\Utils\DOMCompat;
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class CommentModifier {
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private function __construct() {
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}
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/**
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* Add an attribute to a list item to remove pre-whitespace in Parsoid
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*
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* @param DOMElement $listItem List item element
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*/
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private static function whitespaceParsoidHack( DOMElement $listItem ) : void {
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// HACK: Setting data-parsoid removes the whitespace after the list item,
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// which makes nested lists work.
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// This is undocumented behaviour and probably very fragile.
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$listItem->setAttribute( 'data-parsoid', '{}' );
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}
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/**
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* Remove extra linebreaks from a wikitext string
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*
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* @param string $wikitext Wikitext
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* @return string
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*/
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public static function sanitizeWikitextLinebreaks( string $wikitext ) : string {
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$wikitext = CommentUtils::htmlTrim( $wikitext );
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$wikitext = preg_replace( "/\r/", "\n", $wikitext );
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$wikitext = preg_replace( "/\n+/", "\n", $wikitext );
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return $wikitext;
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}
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/**
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* Given a comment and a reply link, add the reply link to its document's DOM tree, at the end of
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* the comment.
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*
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* @param CommentItem $comment Comment item
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* @param DOMElement $linkNode Reply link
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*/
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public static function addReplyLink( CommentItem $comment, DOMElement $linkNode ) : void {
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$target = $comment->getRange()->endContainer;
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// Insert the link before trailing whitespace.
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// In the MediaWiki parser output, <ul>/<dl> nodes are preceded by a newline. Normally it isn't
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// visible on the page. But if we insert an inline element (the reply link) after it, it becomes
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// meaningful and gets rendered, which results in additional spacing before some reply links.
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// Split the text node, so that we can insert the link before the trailing whitespace.
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if ( $target->nodeType === XML_TEXT_NODE ) {
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preg_match( '/\s*$/', $target->nodeValue, $matches, PREG_OFFSET_CAPTURE );
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$byteOffset = $matches[0][1];
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$charOffset = mb_strlen(
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substr( $target->nodeValue, 0, $byteOffset )
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);
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$target->splitText( $charOffset );
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}
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$target->parentNode->insertBefore( $linkNode, $target->nextSibling );
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}
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/**
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* Given a comment, add a list item to its document's DOM tree, inside of which a reply to said
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* comment can be added.
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*
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* The DOM tree is suitably rearranged to ensure correct indentation level of the reply (wrapper
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* nodes are added, and other nodes may be moved around).
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*
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* @param CommentItem $comment Comment item
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* @return DOMElement
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*/
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public static function addListItem( CommentItem $comment ) : DOMElement {
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$listTypeMap = [
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'li' => 'ul',
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'dd' => 'dl'
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];
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// 1. Start at given comment
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// 2. Skip past all comments with level greater than the given
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// (or in other words, all replies, and replies to replies, and so on)
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// 3. Add comment with level of the given comment plus 1
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$curComment = $comment;
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while ( count( $curComment->getReplies() ) ) {
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$replies = $curComment->getReplies();
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$curComment = end( $replies );
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}
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// Tag names for lists and items we're going to insert
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// TODO Add an option to prefer bulleted lists (ul/li)
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$itemType = 'dd';
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$listType = $listTypeMap[ $itemType ];
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$desiredLevel = $comment->getLevel() + 1;
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$target = $curComment->getRange()->endContainer;
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// target is a text node or an inline element at the end of a "paragraph"
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// (not necessarily paragraph node).
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// First, we need to find a block-level parent that we can mess with.
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// If we can't find a surrounding list item or paragraph (e.g. maybe we're inside a table cell
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// or something), take the parent node and hope for the best.
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$parent = CommentUtils::closestElement( $target, [ 'li', 'dd', 'p' ] ) ??
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$target->parentNode;
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while ( $target->parentNode !== $parent ) {
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$target = $target->parentNode;
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}
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// parent is a list item or paragraph (hopefully)
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// target is an inline node within it
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// Instead of just using $curComment->getLevel(), consider indentation of lists within the
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// comment (T252702)
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$curLevel = CommentUtils::getIndentLevel( $target, $curComment->getRootNode() ) + 1;
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$item = null;
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if ( $curLevel < $desiredLevel ) {
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// Insert more lists after the target to increase nesting.
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// If the comment is fully covered by some wrapper element, insert replies outside that wrapper.
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// This will often just be a paragraph node (<p>), but it can be a <div> or <table> that serves
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// as some kind of a fancy frame, which are often used for barnstars and announcements.
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$covered = CommentUtils::getFullyCoveredSiblings( $curComment );
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if ( $curLevel === 1 && $covered ) {
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$target = end( $covered );
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$parent = $target->parentNode;
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}
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// If we can't insert a list directly inside this element, insert after it.
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// TODO Figure out if this is still needed, the wrapper check above should handle all cases
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if ( strtolower( $parent->tagName ) === 'p' || strtolower( $parent->tagName ) === 'pre' ) {
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$parent = $parent->parentNode;
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$target = $target->parentNode;
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}
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// Parsoid puts HTML comments which appear at the end of the line in wikitext outside the paragraph,
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// but we usually shouldn't insert replies between the paragraph and such comments. (T257651)
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// Skip over comments and whitespace, but only update target when skipping past comments.
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$pointer = $target;
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while (
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$pointer->nextSibling && (
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$pointer->nextSibling instanceof DOMComment ||
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(
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$pointer->nextSibling instanceof DOMText &&
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CommentUtils::htmlTrim( $pointer->nextSibling->nodeValue ) === ''
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)
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)
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) {
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$pointer = $pointer->nextSibling;
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if ( $pointer instanceof DOMComment ) {
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$target = $pointer;
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}
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}
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// Insert required number of wrappers
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while ( $curLevel < $desiredLevel ) {
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$list = $target->ownerDocument->createElement( $listType );
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// Setting modified would only be needed for removeAddedListItem,
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// which isn't needed on the server
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// $list->setAttribute( 'dt-modified', 'new' );
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$item = $target->ownerDocument->createElement( $itemType );
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// $item->setAttribute( 'dt-modified', 'new' );
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self::whitespaceParsoidHack( $item );
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$parent->insertBefore( $list, $target->nextSibling );
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$list->appendChild( $item );
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$target = $item;
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$parent = $list;
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$curLevel++;
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}
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} else {
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// Split the ancestor nodes after the target to decrease nesting.
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do {
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// If target is the last child of its parent, no need to split it
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if ( $target->nextSibling ) {
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// Create new identical node after the parent
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$newNode = $parent->cloneNode( false );
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// $parent->setAttribute( 'dt-modified', 'split' );
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$parent->parentNode->insertBefore( $newNode, $parent->nextSibling );
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// Move nodes following target to the new node
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while ( $target->nextSibling ) {
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$newNode->appendChild( $target->nextSibling );
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}
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}
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$target = $parent;
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$parent = $parent->parentNode;
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// Decrease nesting level if we escaped outside of a list
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if ( isset( $listTypeMap[ strtolower( $target->tagName ) ] ) ) {
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$curLevel--;
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}
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} while ( $curLevel >= $desiredLevel );
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// parent is now a list, target is a list item
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if ( $itemType === strtolower( $target->tagName ) ) {
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$item = $target->ownerDocument->createElement( $itemType );
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// $item->setAttribute( 'dt-modified', 'new' );
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self::whitespaceParsoidHack( $item );
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$parent->insertBefore( $item, $target->nextSibling );
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} else {
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// This is the wrong type of list, split it one more time
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// If target is the last child of its parent, no need to split it
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if ( $target->nextSibling ) {
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// Create new identical node after the parent
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$newNode = $parent->cloneNode( false );
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// $parent->setAttribute( 'dt-modified', 'split' );
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$parent->parentNode->insertBefore( $newNode, $parent->nextSibling );
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// Move nodes following target to the new node
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while ( $target->nextSibling ) {
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$newNode->appendChild( $target->nextSibling );
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}
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}
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$target = $parent;
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$parent = $parent->parentNode;
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// Insert a list of the right type in the middle
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$list = $target->ownerDocument->createElement( $listType );
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// Setting modified would only be needed for removeAddedListItem,
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// which isn't needed on the server
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// $list->setAttribute( 'dt-modified', 'new' );
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$item = $target->ownerDocument->createElement( $itemType );
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// $item->setAttribute( 'dt-modified', 'new' );
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self::whitespaceParsoidHack( $item );
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$parent->insertBefore( $list, $target->nextSibling );
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$list->appendChild( $item );
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}
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}
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if ( $item === null ) {
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throw new \LogicException( __METHOD__ . ' no item found' );
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}
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return $item;
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}
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// removeAddedListItem is only needed in the client
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/**
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* Unwrap a top level list, converting list item text to paragraphs
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*
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* Assumes that the list has a parent node.
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*
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* @param DOMnode $list DOM node, will be wrapepd if it is a list element (dl/ol/ul)
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*/
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public static function unwrapList( DOMnode $list ) : void {
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$doc = $list->ownerDocument;
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$container = $list->parentNode;
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$referenceNode = $list;
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if ( !(
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$list instanceof DOMElement && (
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strtolower( $list->tagName ) === 'dl' ||
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strtolower( $list->tagName ) === 'ol' ||
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strtolower( $list->tagName ) === 'ul'
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)
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) ) {
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// Not a list, leave alone (e.g. auto-generated ref block)
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return;
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}
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// If the whole list is a template return it unmodified (T253150)
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if ( CommentUtils::getTranscludedFromElement( $list ) ) {
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return;
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}
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while ( $list->firstChild ) {
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if ( $list->firstChild->nodeType === XML_ELEMENT_NODE ) {
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// Move <dd> contents to <p>
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$p = $doc->createElement( 'p' );
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while ( $list->firstChild->firstChild ) {
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// If contents is a block element, place outside the paragraph
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// and start a new paragraph after
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if ( CommentUtils::isBlockElement( $list->firstChild->firstChild ) ) {
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if ( $p->firstChild ) {
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$insertBefore = $referenceNode->nextSibling;
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$referenceNode = $p;
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$container->insertBefore( $p, $insertBefore );
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}
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$insertBefore = $referenceNode->nextSibling;
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$referenceNode = $list->firstChild->firstChild;
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$container->insertBefore( $list->firstChild->firstChild, $insertBefore );
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$p = $doc->createElement( 'p' );
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} else {
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$p->appendChild( $list->firstChild->firstChild );
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}
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}
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if ( $p->firstChild ) {
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$insertBefore = $referenceNode->nextSibling;
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$referenceNode = $p;
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$container->insertBefore( $p, $insertBefore );
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}
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$list->removeChild( $list->firstChild );
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} else {
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// Text node / comment node, probably empty
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$insertBefore = $referenceNode->nextSibling;
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$referenceNode = $list->firstChild;
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$container->insertBefore( $list->firstChild, $insertBefore );
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}
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}
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$container->removeChild( $list );
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}
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/**
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* Add another list item after the given one.
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*
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* @param DOMElement $previousItem
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* @return DOMElement
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*/
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public static function addSiblingListItem( DOMElement $previousItem ) : DOMElement {
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$listItem = $previousItem->ownerDocument->createElement( $previousItem->tagName );
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self::whitespaceParsoidHack( $listItem );
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$previousItem->parentNode->insertBefore( $listItem, $previousItem->nextSibling );
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return $listItem;
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}
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/**
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* Create an element that will convert to the provided wikitext
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*
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* @param DOMDocument $doc Document
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* @param string $wt Wikitext
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* @return DOMElement Element
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*/
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public static function createWikitextNode( DOMDocument $doc, string $wt ) : DOMElement {
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$span = $doc->createElement( 'span' );
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$span->setAttribute( 'typeof', 'mw:Transclusion' );
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$span->setAttribute( 'data-mw', json_encode( [ 'parts' => [ $wt ] ] ) );
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return $span;
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}
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/**
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* Check whether wikitext contains a user signature.
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*
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* @param string $wikitext
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* @return bool
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*/
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public static function isWikitextSigned( string $wikitext ) : bool {
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$wikitext = CommentUtils::htmlTrim( $wikitext );
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// Contains ~~~~ (four tildes), but not ~~~~~ (five tildes), at the end.
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return (bool)preg_match( '/([^~]|^)~~~~$/', $wikitext );
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}
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/**
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* Check whether HTML node contains a user signature.
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*
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* @param DOMElement $container
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* @return bool
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*/
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public static function isHtmlSigned( DOMElement $container ) : bool {
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$xpath = new DOMXPath( $container->ownerDocument );
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// Good enough?…
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$matches = $xpath->query( './/span[@typeof="mw:Transclusion"][contains(@data-mw,"~~~~")]', $container );
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if ( $matches->length === 0 ) {
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return false;
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}
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$lastSig = $matches->item( $matches->length - 1 );
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// Signature must be at the end of the comment - there must be no sibling following this node, or its parents
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$node = $lastSig;
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while ( $node ) {
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// Skip over whitespace nodes
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while (
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$node->nextSibling &&
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$node->nextSibling->nodeType === XML_TEXT_NODE &&
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CommentUtils::htmlTrim( $node->nextSibling->nodeValue ) === ''
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) {
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$node = $node->nextSibling;
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}
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if ( $node->nextSibling ) {
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return false;
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}
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$node = $node->parentNode;
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}
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return true;
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}
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/**
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* Append a user signature to the comment in the container.
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*
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* @param DOMElement $container
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*/
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public static function appendSignature( DOMElement $container ) : void {
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$doc = $container->ownerDocument;
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// If the last node isn't a paragraph (e.g. it's a list created in visual mode), then
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// add another paragraph to contain the signature.
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if ( strtolower( $container->lastChild->nodeName ) !== 'p' ) {
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$container->appendChild( $doc->createElement( 'p' ) );
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}
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// Sign the last line
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// TODO: When we implement posting new topics, the leading space will create an indent-pre
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$container->lastChild->appendChild(
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self::createWikitextNode(
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$doc,
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wfMessage( 'discussiontools-signature-prefix' )->inContentLanguage()->text() . '~~~~'
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)
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);
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}
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/**
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* Add a reply to a specific comment
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*
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* @param CommentItem $comment Comment being replied to
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* @param DOMElement $container Container of comment DOM nodes
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*/
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public static function addReply( CommentItem $comment, DOMElement $container ) {
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$newParsoidItem = null;
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// Transfer comment DOM to Parsoid DOM
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// Wrap every root node of the document in a new list item (dd/li).
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// In wikitext mode every root node is a paragraph.
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// In visual mode the editor takes care of preventing problematic nodes
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// like <table> or <h2> from ever occurring in the comment.
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while ( $container->childNodes->length ) {
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if ( !$newParsoidItem ) {
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$newParsoidItem = self::addListItem( $comment );
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} else {
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$newParsoidItem = self::addSiblingListItem( $newParsoidItem );
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}
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$newParsoidItem->appendChild( $container->firstChild );
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}
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}
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/**
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* Create a container of comment DOM nodes from wikitext
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*
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* @param CommentItem $comment Comment being replied to
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* @param string $wikitext Wikitext
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*/
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public static function addWikitextReply( $comment, $wikitext ) {
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$doc = $comment->getRange()->endContainer->ownerDocument;
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$container = $doc->createElement( 'div' );
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$wikitext = self::sanitizeWikitextLinebreaks( $wikitext );
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$lines = explode( "\n", $wikitext );
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foreach ( $lines as $line ) {
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$p = $doc->createElement( 'p' );
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$p->appendChild( self::createWikitextNode( $doc, $line ) );
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$container->appendChild( $p );
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}
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if ( !self::isWikitextSigned( $wikitext ) ) {
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self::appendSignature( $container );
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}
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self::addReply( $comment, $container );
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}
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/**
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* Create a container of comment DOM nodes from HTML
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*
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* @param CommentItem $comment Comment being replied to
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* @param string $html HTML
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*/
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public static function addHtmlReply( $comment, $html ) {
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$doc = $comment->getRange()->endContainer->ownerDocument;
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$container = $doc->createElement( 'div' );
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DOMCompat::setInnerHTML( $container, $html );
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// Remove empty lines
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// This should really be anything that serializes to empty string in wikitext,
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// (e.g. <h2></h2>) but this will catch most cases
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// Create a non-live child node list, so we don't have to worry about it changing
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// as nodes are removed.
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$childNodeList = iterator_to_array( $container->childNodes );
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foreach ( $childNodeList as $node ) {
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if (
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strtolower( $node->nodeName ) === 'p' &&
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CommentUtils::htmlTrim( DOMCompat::getInnerHTML( $node ) ) === ''
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) {
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$container->removeChild( $node );
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}
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}
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if ( !self::isHtmlSigned( $container ) ) {
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self::appendSignature( $container );
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}
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self::addReply( $comment, $container );
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}
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}
|