mediawiki-extensions-Discus.../modules/modifier.js
Ed Sanders d1e58841af Rename removeListItem to removeAddedListItem and remove in PHP
This method shouldn't be required on the server. Leave comments
relating to it in addListItem so JS & PHP can be kept in sync.

Change-Id: I849fac660faf6e750272c20776f96b9250f96b1b
2020-05-18 19:25:08 +00:00

273 lines
8.5 KiB
JavaScript

/* global $:off */
'use strict';
var
utils = require( './utils.js' );
/**
* Add an attribute to a list item to remove pre-whitespace in Parsoid
*
* @param {HTMLElement} listItem List item element
*/
function whitespaceParsoidHack( listItem ) {
// HACK: Setting data-parsoid removes the whitespace after the list item,
// which makes nested lists work.
// This is undocumented behaviour and probably very fragile.
listItem.setAttribute( 'data-parsoid', '{}' );
}
/**
* Given a comment and a reply link, add the reply link to its document's DOM tree, at the end of
* the comment.
*
* @param {Object} comment Comment data returned by parser#groupThreads
* @param {HTMLElement} linkNode Reply link
*/
function addReplyLink( comment, linkNode ) {
var target = comment.range.endContainer;
// Skip to the end of the "paragraph". This only looks at tag names and can be fooled by CSS, but
// avoiding that would be more difficult and slower.
while ( target.nextSibling && !ve.isBlockElement( target.nextSibling ) ) {
target = target.nextSibling;
}
// Insert the link before trailing whitespace.
// In the MediaWiki parser output, <ul>/<dl> nodes are preceded by a newline. Normally it isn't
// visible on the page. But if we insert an inline element (the reply link) after it, it becomes
// meaningful and gets rendered, which results in additional spacing before some reply links.
// Split the text node, so that we can insert the link before the trailing whitespace.
if ( target.nodeType === Node.TEXT_NODE ) {
target.splitText( target.textContent.match( /\s*$/ ).index );
}
target.parentNode.insertBefore( linkNode, target.nextSibling );
}
/**
* Given a comment, add a list item to its document's DOM tree, inside of which a reply to said
* comment can be added.
*
* The DOM tree is suitably rearranged to ensure correct indentation level of the reply (wrapper
* nodes are added, and other nodes may be moved around).
*
* @param {Object} comment Comment data returned by parser#groupThreads
* @return {HTMLElement}
*/
function addListItem( comment ) {
var
curComment, curLevel, desiredLevel,
target, parent, listType, itemType, list, item, newNode,
listTypeMap = {
li: 'ul',
dd: 'dl'
};
// 1. Start at given comment
// 2. Skip past all comments with level greater than the given
// (or in other words, all replies, and replies to replies, and so on)
// 3. Add comment with level of the given comment plus 1
curComment = comment;
while ( curComment.replies.length ) {
curComment = curComment.replies[ curComment.replies.length - 1 ];
}
desiredLevel = comment.level + 1;
curLevel = curComment.level;
target = curComment.range.endContainer;
// Skip to the end of the "paragraph". This only looks at tag names and can be fooled by CSS, but
// avoiding that would be more difficult and slower.
while ( target.nextSibling && !ve.isBlockElement( target.nextSibling ) ) {
target = target.nextSibling;
}
// target is a text node or an inline element at the end of a "paragraph" (not necessarily paragraph node).
// First, we need to find a block-level parent that we can mess with.
// If we can't find a surrounding list item or paragraph (e.g. maybe we're inside a table cell
// or something), take the parent node and hope for the best.
parent = utils.closestElement( target, [ 'li', 'dd', 'p' ] ) || target.parentNode;
while ( target.parentNode !== parent ) {
target = target.parentNode;
}
// parent is a list item or paragraph (hopefully)
// target is an inline node within it
if ( curLevel < desiredLevel ) {
// Insert more lists after the target to increase nesting.
// If we can't insert a list directly inside this element, insert after it.
// TODO Improve this check
if ( parent.tagName.toLowerCase() === 'p' || parent.tagName.toLowerCase() === 'pre' ) {
parent = parent.parentNode;
target = target.parentNode;
}
// Decide on tag names for lists and items
itemType = parent.tagName.toLowerCase();
itemType = listTypeMap[ itemType ] ? itemType : 'dd';
listType = listTypeMap[ itemType ];
// Insert required number of wrappers
while ( curLevel < desiredLevel ) {
list = target.ownerDocument.createElement( listType );
list.discussionToolsModified = 'new';
item = target.ownerDocument.createElement( itemType );
item.discussionToolsModified = 'new';
whitespaceParsoidHack( item );
parent.insertBefore( list, target.nextSibling );
list.appendChild( item );
target = item;
parent = list;
curLevel++;
}
} else if ( curLevel >= desiredLevel ) {
// Split the ancestor nodes after the target to decrease nesting.
do {
// If target is the last child of its parent, no need to split it
if ( target.nextSibling ) {
// Create new identical node after the parent
newNode = parent.cloneNode( false );
parent.discussionToolsModified = 'split';
parent.parentNode.insertBefore( newNode, parent.nextSibling );
// Move nodes following target to the new node
while ( target.nextSibling ) {
newNode.appendChild( target.nextSibling );
}
}
target = parent;
parent = parent.parentNode;
// Decrease nesting level if we escaped outside of a list
if ( listTypeMap[ target.tagName.toLowerCase() ] ) {
curLevel--;
}
} while ( curLevel >= desiredLevel );
// parent is now a list, target is a list item
item = target.ownerDocument.createElement( target.tagName );
item.discussionToolsModified = 'new';
whitespaceParsoidHack( item );
parent.insertBefore( item, target.nextSibling );
}
return item;
}
/**
* Undo the effects of #addListItem, also removing or merging any affected parent nodes.
*
* @param {HTMLElement} node
*/
function removeAddedListItem( node ) {
var nextNode;
while ( node && node.discussionToolsModified ) {
if ( node.discussionToolsModified === 'new' ) {
nextNode = node.previousSibling || node.parentNode;
// Remove this node
delete node.discussionToolsModified;
node.parentNode.removeChild( node );
} else if ( node.discussionToolsModified === 'split' ) {
// Children might be split too, if so, descend into them afterwards
if ( node.lastChild && node.lastChild.discussionToolsModified === 'split' ) {
node.discussionToolsModified = 'done';
nextNode = node.lastChild;
} else {
delete node.discussionToolsModified;
nextNode = node.parentNode;
}
// Merge the following sibling node back into this one
while ( node.nextSibling.firstChild ) {
node.appendChild( node.nextSibling.firstChild );
}
node.parentNode.removeChild( node.nextSibling );
} else {
nextNode = node.parentNode;
}
node = nextNode;
}
}
/**
* Unwrap a top level list, converting list item text to paragraphs
*
* Assumes that the list is the only child of it's parent.
*
* @param {HTMLElement} list List element (dl/ol/ul)
*/
function unwrapList( list ) {
var p,
doc = list.ownerDocument,
container = list.parentNode;
container.removeChild( list );
while ( list.firstChild ) {
if ( list.firstChild.nodeType === Node.ELEMENT_NODE ) {
// Move <dd> contents to <p>
p = doc.createElement( 'p' );
while ( list.firstChild.firstChild ) {
// If contents is a block element, place outside the paragraph
// and start a new paragraph after
if ( ve.isBlockElement( list.firstChild.firstChild ) ) {
if ( p.firstChild ) {
container.appendChild( p );
}
container.appendChild( list.firstChild.firstChild );
p = doc.createElement( 'p' );
} else {
p.appendChild( list.firstChild.firstChild );
}
}
if ( p.firstChild ) {
container.appendChild( p );
}
list.removeChild( list.firstChild );
} else {
// Text node / comment node, probably empty
container.appendChild( list.firstChild );
}
}
}
/**
* Add another list item after the given one.
*
* @param {HTMLElement} previousItem
* @return {HTMLElement}
*/
function addSiblingListItem( previousItem ) {
var listItem = previousItem.ownerDocument.createElement( previousItem.tagName.toLowerCase() );
whitespaceParsoidHack( listItem );
previousItem.parentNode.insertBefore( listItem, previousItem.nextSibling );
return listItem;
}
function createWikitextNode( doc, wt ) {
var span = doc.createElement( 'span' );
span.setAttribute( 'typeof', 'mw:Transclusion' );
span.setAttribute( 'data-mw', JSON.stringify( { parts: [ wt ] } ) );
return span;
}
module.exports = {
addReplyLink: addReplyLink,
addListItem: addListItem,
removeAddedListItem: removeAddedListItem,
addSiblingListItem: addSiblingListItem,
unwrapList: unwrapList,
createWikitextNode: createWikitextNode
};