mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-23 16:06:53 +00:00
329a268564
Makes the class more similar to PHP. The non-native ranges exist for efficiency, but users will usually want native ranges. Change-Id: Ifd7dd034d2e0f3b9af050ecdab3e063df73dde5e
673 lines
18 KiB
JavaScript
673 lines
18 KiB
JavaScript
'use strict';
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/* global $:off */
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/**
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* @constant
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*/
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var NEW_TOPIC_COMMENT_ID = 'new|' + mw.config.get( 'wgRelevantPageName' );
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/**
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* @param {Node} node
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* @return {boolean} Node is a block element
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*/
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function isBlockElement( node ) {
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return node instanceof HTMLElement && ve.isBlockElement( node );
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}
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var solTransparentLinkRegexp = /(?:^|\s)mw:PageProp\/(?:Category|redirect|Language)(?=$|\s)/;
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/**
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* @param {Node} node
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* @return {boolean} Node is considered a rendering-transparent node in Parsoid
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*/
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function isRenderingTransparentNode( node ) {
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var nextSibling = node.nextSibling;
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return (
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node.nodeType === Node.COMMENT_NODE ||
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node.nodeType === Node.ELEMENT_NODE && (
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node.tagName.toLowerCase() === 'meta' ||
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(
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node.tagName.toLowerCase() === 'link' &&
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solTransparentLinkRegexp.test( 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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node.tagName.toLowerCase() === 'span' &&
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( node.getAttribute( 'typeof' ) || '' ).split( ' ' ).indexOf( 'mw:Transclusion' ) !== -1 &&
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!htmlTrim( node.innerHTML ) &&
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(
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!nextSibling || nextSibling.nodeType !== Node.ELEMENT_NODE ||
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// Maybe we should be checking all of the about-grouped nodes to see if they're empty,
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// but that's prooobably not needed in practice, and it leads to a quadratic worst case.
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nextSibling.getAttribute( 'about' ) !== node.getAttribute( 'about' )
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)
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)
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)
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);
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}
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/**
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* @param {Node} node
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* @return {boolean} Node was added to the page by DiscussionTools
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*/
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function isOurGeneratedNode( node ) {
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return node.nodeType === Node.ELEMENT_NODE && (
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node.classList.contains( 'ext-discussiontools-init-replylink-buttons' ) ||
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node.hasAttribute( 'data-mw-comment-start' ) ||
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node.hasAttribute( 'data-mw-comment-end' )
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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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var noElementChildrenElementTypes = [
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// https://html.spec.whatwg.org/multipage/syntax.html#elements-2
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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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// Foreign elements
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'math', 'svg',
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// Treated like text when scripting is enabled in the parser
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// https://html.spec.whatwg.org/#the-noscript-element
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'noscript',
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// Replaced elements (that aren't already included above)
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// https://html.spec.whatwg.org/multipage/rendering.html#replaced-elements
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// They might allow element children, but they aren't rendered on the page.
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'audio', 'canvas', 'iframe', 'object', 'video'
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];
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/**
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* @param {Node} node
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* @return {boolean} If true, node can't have element children. If false, it's complicated.
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*/
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function cantHaveElementChildren( node ) {
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return (
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node.nodeType === Node.COMMENT_NODE ||
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node.nodeType === Node.ELEMENT_NODE && (
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noElementChildrenElementTypes.indexOf( node.tagName.toLowerCase() ) !== -1 ||
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// Thumbnail wrappers generated by MediaTransformOutput::linkWrap (T301427),
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// for compatibility with TimedMediaHandler.
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// There is no better way to detect them, and we can't insert markers here,
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// because the media DOM CSS depends on specific tag names and their order :(
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// TODO See if we can remove this condition when wgParserEnableLegacyMediaDOM=false
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// is enabled everywhere.
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(
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[ 'a', 'span' ].indexOf( node.tagName.toLowerCase() ) !== -1 &&
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node.firstChild &&
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cantHaveElementChildren( node.firstChild )
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) ||
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// Do not insert anything inside figures when using wgParserEnableLegacyMediaDOM=false,
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// because their CSS can't handle it (T320285).
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node.tagName.toLowerCase() === 'figure'
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)
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);
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}
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/**
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* Check whether the node is a comment separator (instead of a part of the comment).
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*
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* @param {Node} node
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* @return {boolean}
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*/
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function isCommentSeparator( node ) {
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if ( node.nodeType !== Node.ELEMENT_NODE ) {
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return false;
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}
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var tagName = node.tagName.toLowerCase();
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if ( tagName === 'br' || tagName === 'hr' ) {
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return true;
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}
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// TemplateStyles followed by any of the others
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if ( node.nextSibling &&
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( tagName === 'link' || tagName === 'style' ) &&
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isCommentSeparator( node.nextSibling )
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) {
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return true;
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}
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var classList = node.classList;
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if (
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// Anything marked as not containing comments
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classList.contains( 'mw-notalk' ) ||
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// {{outdent}} templates
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classList.contains( 'outdent-template' ) ||
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// {{tracked}} templates (T313097)
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classList.contains( 'mw-trackedTemplate' )
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) {
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return true;
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}
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// Wikitext definition list term markup (`;`) when used as a fake heading (T265964)
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if ( tagName === 'dl' &&
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node.childNodes.length === 1 &&
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node.firstChild.nodeType === Node.ELEMENT_NODE &&
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node.firstChild.nodeName.toLowerCase() === 'dt'
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) {
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return true;
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}
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return false;
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}
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/**
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* Check whether the node is a comment content. It's a little vague what this means…
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*
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* @param {Node} node Node, should be a leaf node (a node with no children)
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* @return {boolean}
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*/
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function isCommentContent( node ) {
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return (
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( node.nodeType === Node.TEXT_NODE && htmlTrim( node.textContent ) !== '' ) ||
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( cantHaveElementChildren( node ) )
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);
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}
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/**
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* Get the index of a node in its parentNode's childNode list
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*
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* @param {Node} child
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* @return {number} Index in parentNode's childNode list
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*/
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function childIndexOf( child ) {
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var 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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* Find closest ancestor element using one of the given tag names.
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*
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* @param {Node} node
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* @param {string[]} tagNames
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* @return {HTMLElement|null}
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*/
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function closestElement( node, tagNames ) {
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do {
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if (
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node.nodeType === Node.ELEMENT_NODE &&
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tagNames.indexOf( node.tagName.toLowerCase() ) !== -1
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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 {Node} node
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* @return {HTMLElement|null} Transclusion node, null if not found
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*/
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function getTranscludedFromElement( node ) {
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while ( node ) {
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// 1.
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if (
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node.nodeType === Node.ELEMENT_NODE &&
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node.getAttribute( 'about' ) &&
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/^#mwt\d+$/.test( node.getAttribute( 'about' ) )
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) {
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var about = node.getAttribute( 'about' );
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// 2.
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while (
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node.previousSibling &&
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node.previousSibling.nodeType === Node.ELEMENT_NODE &&
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node.previousSibling.getAttribute( 'about' ) === about
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) {
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node = 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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node.getAttribute( 'typeof' ).split( ' ' ).indexOf( 'mw:Transclusion' ) !== -1
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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 {HTMLElement} heading Heading node (`<h1>`-`<h6>`)
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* @return {Array} Array containing a 'node' (HTMLElement) and offset (number)
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*/
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function getHeadlineNodeAndOffset( heading ) {
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// This code assumes that $wgFragmentMode is [ 'html5', 'legacy' ] or [ 'html5' ]
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var headline = heading,
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offset = 0;
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if ( headline.hasAttribute( '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.querySelector( '.mw-headline' );
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if ( !headline ) {
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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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function htmlTrim( str ) {
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// https://infra.spec.whatwg.org/#ascii-whitespace
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return str.replace( /^[\t\n\f\r ]+/, '' ).replace( /[\t\n\f\r ]+$/, '' );
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}
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/**
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* Get the indent level of the 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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* @private
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* @param {Node} node
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* @param {Element} rootNode
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* @return {number}
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*/
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function getIndentLevel( node, rootNode ) {
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var 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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var tagName = node instanceof HTMLElement ? node.tagName.toLowerCase() : null;
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if ( tagName === 'li' || tagName === '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 range.
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*
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* @param {Range} range
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* @return {Node[]}
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*/
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function getCoveredSiblings( range ) {
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var ancestor = range.commonAncestorContainer;
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var siblings = ancestor.childNodes;
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var start = 0;
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var end = siblings.length - 1;
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// Find first of the siblings that contains the item
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if ( ancestor === range.startContainer ) {
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start = range.startOffset;
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} else {
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while ( !siblings[ start ].contains( range.startContainer ) ) {
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start++;
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}
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}
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// Find last of the siblings that contains the item
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if ( ancestor === range.endContainer ) {
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end = range.endOffset - 1;
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} else {
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while ( !siblings[ end ].contains( range.endContainer ) ) {
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end--;
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}
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}
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return Array.prototype.slice.call( siblings, start, end + 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 Thread item
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* @param {Node} [excludedAncestorNode] Node that shouldn't be included in the result, even if it
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* contains the item and nothing else. This is intended to avoid traversing outside of a node
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* which is a container for all the thread items.
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* @return {Node[]|null}
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*/
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function getFullyCoveredSiblings( item, excludedAncestorNode ) {
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var siblings = getCoveredSiblings( item.getRange() );
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function makeRange( sibs ) {
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var range = sibs[ 0 ].ownerDocument.createRange();
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range.setStartBefore( sibs[ 0 ] );
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range.setEndAfter( sibs[ sibs.length - 1 ] );
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return range;
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}
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var matches = compareRanges( makeRange( siblings ), item.getRange() ) === 'equal';
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if ( matches ) {
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// If these are all of the children (or the only child), go up one more level
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var parent;
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while (
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( parent = siblings[ 0 ].parentNode ) &&
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parent !== excludedAncestorNode &&
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compareRanges( makeRange( [ parent ] ), item.getRange() ) === 'equal'
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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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* Get a MediaWiki page title from a URL.
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*
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* @private
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* @param {string} url Absolute URL
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* @return {string|null} Page title, or null if this isn't a link to a page
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*/
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function getTitleFromUrl( url ) {
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if ( !url ) {
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return null;
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}
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var parsedUrl = new URL( url );
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if ( parsedUrl.searchParams.get( 'title' ) ) {
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return parsedUrl.searchParams.get( 'title' );
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}
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// wgArticlePath is site config so is trusted
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// eslint-disable-next-line security/detect-non-literal-regexp
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var articlePathRegexp = new RegExp(
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mw.util.escapeRegExp( mw.config.get( 'wgArticlePath' ) )
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.replace( '\\$1', '(.*)' )
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);
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var match;
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if ( ( match = parsedUrl.pathname.match( articlePathRegexp ) ) ) {
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return decodeURIComponent( match[ 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 {Node} node Node to start at
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* @param {Function} 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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function linearWalk( node, callback ) {
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var
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result = null,
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withinNode = node.parentNode,
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beforeNode = 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;
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beforeNode = beforeNode.firstChild;
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} else {
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result = callback( 'leave', withinNode );
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beforeNode = withinNode.nextSibling;
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withinNode = withinNode.parentNode;
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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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* Like #linearWalk, but it goes backwards.
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*
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* @inheritdoc #linearWalk
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*/
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function linearWalkBackwards( node, callback ) {
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var
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result = null,
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withinNode = node.parentNode,
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beforeNode = 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;
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beforeNode = beforeNode.lastChild;
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} else {
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result = callback( 'leave', withinNode );
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beforeNode = withinNode.previousSibling;
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withinNode = withinNode.parentNode;
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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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* @param {Range} range
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* @return {Node}
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*/
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function getRangeFirstNode( range ) {
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return range.startContainer.childNodes.length ?
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range.startContainer.childNodes[ range.startOffset ] :
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range.startContainer;
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}
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/**
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* @param {Range} range
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* @return {Node}
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*/
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function getRangeLastNode( range ) {
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return range.endContainer.childNodes.length ?
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range.endContainer.childNodes[ range.endOffset - 1 ] :
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range.endContainer;
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}
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/**
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* Check whether two ranges overlap, and how.
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*
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* Includes a hack to check for "almost equal" ranges (whose start/end boundaries only differ by
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* "uninteresting" nodes that we ignore when detecting comments), and treat them as equal.
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*
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* Illustration of return values:
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* [ equal ]
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* |[ contained ]|
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* [ | contains | ]
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* [overlap|start] |
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* | [overlap|end]
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* [before] | |
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* | | [after]
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*
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* @param {Range} a
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* @param {Range} b
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* @return {string} One of:
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* - 'equal': Ranges A and B are equal
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* - 'contains': Range A contains range B
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* - 'contained': Range A is contained within range B
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* - 'after': Range A is before range B
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* - 'before': Range A is after range B
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* - 'overlapstart': Start of range A overlaps range B
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* - 'overlapend': End of range A overlaps range B
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*/
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function compareRanges( a, b ) {
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// Compare the positions of: start of A to start of B, start of A to end of B, and so on.
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// Watch out, the constant names are the opposite of what they should be.
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var startToStart = a.compareBoundaryPoints( Range.START_TO_START, b );
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var startToEnd = a.compareBoundaryPoints( Range.END_TO_START, b );
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var endToStart = a.compareBoundaryPoints( Range.START_TO_END, b );
|
|
var endToEnd = a.compareBoundaryPoints( Range.END_TO_END, b );
|
|
|
|
// Check for almost equal ranges (boundary points only differing by uninteresting nodes)
|
|
if (
|
|
( startToStart < 0 && compareRangesAlmostEqualBoundaries( a, b, 'start' ) ) ||
|
|
( startToStart > 0 && compareRangesAlmostEqualBoundaries( b, a, 'start' ) )
|
|
) {
|
|
startToStart = 0;
|
|
}
|
|
if (
|
|
( endToEnd < 0 && compareRangesAlmostEqualBoundaries( a, b, 'end' ) ) ||
|
|
( endToEnd > 0 && compareRangesAlmostEqualBoundaries( b, a, 'end' ) )
|
|
) {
|
|
endToEnd = 0;
|
|
}
|
|
|
|
if ( startToStart === 0 && endToEnd === 0 ) {
|
|
return 'equal';
|
|
}
|
|
if ( startToStart <= 0 && endToEnd >= 0 ) {
|
|
return 'contains';
|
|
}
|
|
if ( startToStart >= 0 && endToEnd <= 0 ) {
|
|
return 'contained';
|
|
}
|
|
if ( startToEnd >= 0 ) {
|
|
return 'after';
|
|
}
|
|
if ( endToStart <= 0 ) {
|
|
return 'before';
|
|
}
|
|
if ( startToStart > 0 && startToEnd < 0 && endToEnd >= 0 ) {
|
|
return 'overlapstart';
|
|
}
|
|
if ( endToEnd < 0 && endToStart > 0 && startToStart <= 0 ) {
|
|
return 'overlapend';
|
|
}
|
|
|
|
throw new Error( 'Unreachable' );
|
|
}
|
|
|
|
/**
|
|
* Check if the given boundary points of ranges A and B are almost equal (only differing by
|
|
* uninteresting nodes).
|
|
*
|
|
* Boundary of A must be before the boundary of B in the tree.
|
|
*
|
|
* @param {Range} a
|
|
* @param {Range} b
|
|
* @param {string} boundary 'start' or 'end'
|
|
* @return {boolean}
|
|
*/
|
|
function compareRangesAlmostEqualBoundaries( a, b, boundary ) {
|
|
// This code is awful, but several attempts to rewrite it made it even worse.
|
|
// You're welcome to give it a try.
|
|
|
|
var from = boundary === 'end' ? getRangeLastNode( a ) : getRangeFirstNode( a );
|
|
var to = boundary === 'end' ? getRangeLastNode( b ) : getRangeFirstNode( b );
|
|
|
|
var skipNode = null;
|
|
if ( boundary === 'end' ) {
|
|
skipNode = from;
|
|
}
|
|
|
|
var foundContent = false;
|
|
linearWalk(
|
|
from,
|
|
function ( event, n ) {
|
|
if ( n === to && event === ( boundary === 'end' ? 'leave' : 'enter' ) ) {
|
|
return true;
|
|
}
|
|
if ( skipNode ) {
|
|
if ( n === skipNode && event === 'leave' ) {
|
|
skipNode = null;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if ( event === 'enter' ) {
|
|
if (
|
|
isCommentSeparator( n ) ||
|
|
isRenderingTransparentNode( n ) ||
|
|
isOurGeneratedNode( n )
|
|
) {
|
|
skipNode = n;
|
|
|
|
} else if (
|
|
isCommentContent( n )
|
|
) {
|
|
foundContent = true;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
);
|
|
|
|
return !foundContent;
|
|
}
|
|
|
|
/**
|
|
* Get the ID for a new topics subscription from a page title
|
|
*
|
|
* @param {mw.Title} title Page title
|
|
* @return {string} ID for a new topics subscription
|
|
*/
|
|
function getNewTopicsSubscriptionId( title ) {
|
|
return 'p-topics-' + title.getNamespaceId() + ':' + title.getMain();
|
|
}
|
|
|
|
/**
|
|
* Check whether a jQuery event represents a plain left click, without any modifiers
|
|
*
|
|
* @param {jQuery.Event} e
|
|
* @return {boolean} Whether it was an unmodified left click
|
|
*/
|
|
function isUnmodifiedLeftClick( e ) {
|
|
return e.which === OO.ui.MouseButtons.LEFT && !( e.shiftKey || e.altKey || e.ctrlKey || e.metaKey );
|
|
}
|
|
|
|
module.exports = {
|
|
NEW_TOPIC_COMMENT_ID: NEW_TOPIC_COMMENT_ID,
|
|
isBlockElement: isBlockElement,
|
|
isRenderingTransparentNode: isRenderingTransparentNode,
|
|
isCommentSeparator: isCommentSeparator,
|
|
isCommentContent: isCommentContent,
|
|
cantHaveElementChildren: cantHaveElementChildren,
|
|
childIndexOf: childIndexOf,
|
|
closestElement: closestElement,
|
|
getIndentLevel: getIndentLevel,
|
|
getCoveredSiblings: getCoveredSiblings,
|
|
getFullyCoveredSiblings: getFullyCoveredSiblings,
|
|
getTranscludedFromElement: getTranscludedFromElement,
|
|
getHeadlineNodeAndOffset: getHeadlineNodeAndOffset,
|
|
htmlTrim: htmlTrim,
|
|
getTitleFromUrl: getTitleFromUrl,
|
|
linearWalk: linearWalk,
|
|
linearWalkBackwards: linearWalkBackwards,
|
|
compareRanges: compareRanges,
|
|
getNewTopicsSubscriptionId: getNewTopicsSubscriptionId,
|
|
isUnmodifiedLeftClick: isUnmodifiedLeftClick
|
|
};
|