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( `${bucket} previews` ) : 'unknown';\n};\n","import bracketedPixelRatio from './bracketedPixelRatio';\n\nconst bpr = bracketedPixelRatio();\n\nexport default {\n\tBRACKETED_DEVICE_PIXEL_RATIO: bpr,\n\t// See https://phabricator.wikimedia.org/T272169: requesting a larger thumbnail to avoid bluriness\n\tTHUMBNAIL_SIZE: 320 * Math.max( bpr, 1.5 ),\n\tEXTRACT_LENGTH: 525\n};\n","/**\n * @module bracketedPixelRatio\n */\n\n/**\n * Normalizes a user's device pixel ratio to either 1, 1.5, or 2.\n *\n * This is important when the server resizes images on the fly in order to\n * reduce the work it has to do for device pixel ratios that deviate from a\n * set of common ratios.\n *\n * Adapted from mediawiki/core /resources/src/jquery/jquery.hidpi.js\n *\n * @param {number} [dpr=window.devicePixelRatio]\n * @return {number} The bracketed device pixel ratio\n */\nexport default function ( dpr = window.devicePixelRatio ) {\n\tif ( !dpr ) {\n\t\t// Probably legacy browser so assume 1\n\t\treturn 1;\n\t}\n\n\tif ( dpr > 1.5 ) {\n\t\treturn 2;\n\t}\n\n\tif ( dpr > 1 ) {\n\t\treturn 1.5;\n\t}\n\n\treturn 1;\n}\n","/**\n * @module preview/model\n */\n\n/**\n * Page Preview types as defined in Schema:Popups\n * https://meta.wikimedia.org/wiki/Schema:Popups\n *\n * @constant {Object}\n */\nconst previewTypes = {\n\t/** Empty preview used in error situations */\n\tTYPE_GENERIC: 'generic',\n\t/** Standard page preview with or without thumbnail */\n\tTYPE_PAGE: 'page',\n\t/** Disambiguation page preview */\n\tTYPE_DISAMBIGUATION: 'disambiguation',\n\t/** Reference preview **/\n\tTYPE_REFERENCE: 'reference'\n};\n\nexport { previewTypes };\n\n/**\n * Preview Model\n *\n * @typedef {Object} PreviewModel\n * @property {string} url The canonical URL of the page being previewed\n * @property {string} type One of the previewTypes.TYPE_… constants.\n *\n * @global\n */\n\n/**\n * @typedef {Object} PagePreviewModel\n * @extends PreviewModel\n * @property {string} title\n * @property {Array|undefined} extract `undefined` if the extract isn't\n *  viable, e.g. if it's empty after having ellipsis and parentheticals\n *  removed; this can be used to present default or error states\n * @property {string} languageCode\n * @property {string} languageDirection Either \"ltr\" or \"rtl\", or an empty string if undefined.\n * @property {{source: string, width: number, height: number}|undefined} thumbnail\n * @property {number} pageId Currently not used by any known popup type.\n *\n * @global\n */\n\n/**\n * @typedef {Object} ReferencePreviewModel\n * @extends PreviewModel\n * @property {string} extract An HTML snippet, not necessarily with a single top-level node\n * @property {string} referenceType A type identifier, e.g. \"web\"\n * @property {string} sourceElementId ID of the parent element that triggered the preview\n *\n * @global\n */\n\n/**\n * Creates a page preview model.\n *\n * @param {string} title\n * @param {string} url The canonical URL of the page being previewed\n * @param {string} languageCode\n * @param {string} languageDirection Either \"ltr\" or \"rtl\"\n * @param {Array|undefined|null} extract\n * @param {string} type\n * @param {{source: string, width: number, height: number}|undefined} [thumbnail]\n * @param {number} [pageId]\n * @return {PagePreviewModel}\n */\nexport function createModel(\n\ttitle,\n\turl,\n\tlanguageCode,\n\tlanguageDirection,\n\textract,\n\ttype,\n\tthumbnail,\n\tpageId\n) {\n\tconst processedExtract = processExtract( extract ),\n\t\tpreviewType = getPagePreviewType( type, processedExtract );\n\n\treturn {\n\t\ttitle,\n\t\turl,\n\t\tlanguageCode,\n\t\tlanguageDirection,\n\t\textract: processedExtract,\n\t\ttype: previewType,\n\t\tthumbnail,\n\t\tpageId\n\t};\n}\n\n/**\n * Creates an empty page preview model.\n *\n * @param {string} title\n * @param {string} url\n * @return {PagePreviewModel}\n */\nexport function createNullModel( title, url ) {\n\treturn createModel( title, url, '', '', [], '' );\n}\n\n/**\n * Determines the applicable popup type based on title and link element.\n *\n * @param {Element} el\n * @param {mw.Map} config\n * @param {mw.Title} title\n * @return {string|null}\n */\nexport function getPreviewType( el, config, title ) {\n\tif ( !isSelfLink( title, config ) ) {\n\t\treturn previewTypes.TYPE_PAGE;\n\t}\n\n\t// The other selector can potentially pick up self-links with a class=\"reference\"\n\t// parent, but no fragment\n\tif ( title.getFragment() &&\n\t\tconfig.get( 'wgPopupsReferencePreviews' ) &&\n\t\t// eslint-disable-next-line no-jquery/no-class-state\n\t\t$( el ).parent().hasClass( 'reference' )\n\t) {\n\t\treturn previewTypes.TYPE_REFERENCE;\n\t}\n\n\treturn null;\n}\n\n/**\n * @param {mw.Title} title\n * @param {mw.Map} config\n * @return {boolean} True when the link points to the current page.\n */\nfunction isSelfLink( title, config ) {\n\treturn title.getNamespaceId() === config.get( 'wgNamespaceNumber' ) &&\n\t\ttitle.getMainText() === config.get( 'wgTitle' );\n}\n\n/**\n * Processes the extract returned by the TextExtracts MediaWiki API query\n * module.\n *\n * If the extract is `undefined`, `null`, or empty, then `undefined` is\n * returned.\n *\n * @param {Array|undefined|null} extract\n * @return {Array|undefined} Array when extract is an not empty array, undefined\n *  otherwise\n */\nfunction processExtract( extract ) {\n\tif ( extract === undefined || extract === null || extract.length === 0 ) {\n\t\treturn undefined;\n\t}\n\treturn extract;\n}\n\n/**\n * Determines the page preview type based on whether or not:\n * a. Is the preview empty.\n * b. The preview type matches one of previewTypes.\n * c. Assume standard page preview if both above are false\n *\n * @param {string} type\n * @param {Array|undefined} [processedExtract]\n * @return {string} One of the previewTypes.TYPE_… constants.\n */\n\nfunction getPagePreviewType( type, processedExtract ) {\n\tif ( processedExtract === undefined ) {\n\t\treturn previewTypes.TYPE_GENERIC;\n\t}\n\n\tswitch ( type ) {\n\t\tcase previewTypes.TYPE_GENERIC:\n\t\tcase previewTypes.TYPE_DISAMBIGUATION:\n\t\tcase previewTypes.TYPE_PAGE:\n\t\t\treturn type;\n\t\tdefault:\n\t\t\t/**\n\t\t\t * Assume type=\"page\" if extract exists & not one of previewTypes.\n\t\t\t * Note:\n\t\t\t * - Restbase response includes \"type\" prop but other gateways don't.\n\t\t\t * - event-logging Schema:Popups requires type=\"page\" but restbase\n\t\t\t * provides type=\"standard\". Model must conform to event-logging schema.\n\t\t\t */\n\t\t\treturn previewTypes.TYPE_PAGE;\n\t}\n}\n","/**\n * Improves the plain text extracts\n *\n * @param {string} plainTextExtract\n * @param {string} title\n * @return {Array}\n */\nexport function formatPlainTextExtract( plainTextExtract, title ) {\n\tlet extract = plainTextExtract;\n\tif ( plainTextExtract === undefined ) {\n\t\treturn [];\n\t}\n\n\t// After cleaning the extract it may have been blanked\n\tif ( extract.length === 0 ) {\n\t\treturn [];\n\t}\n\n\textract = makeTitleInExtractBold( extract, title );\n\treturn extract;\n}\n\n/**\n * Converts the extract into a list of elements, which correspond to fragments\n * of the extract. Fragments that match the title verbatim are wrapped in a\n * `<b>` element.\n *\n * Using the bolded elements of the extract of the page directly is covered by\n * [T141651](https://phabricator.wikimedia.org/T141651).\n *\n * Extracted from `mw.popups.renderer.article.getProcessedElements`.\n *\n * @param {string} extract\n * @param {string} title\n * @return {Array} A set of HTML Elements\n */\nfunction makeTitleInExtractBold( extract, title ) {\n\tconst elements = [],\n\t\tboldIdentifier = `<bi-${Math.random()}>`,\n\t\tsnip = `<snip-${Math.random()}>`;\n\n\ttitle = title.replace( /\\s+/g, ' ' ).trim(); // Remove extra white spaces\n\tconst escapedTitle = mw.util.escapeRegExp( title );\n\tconst regExp = new RegExp( `(^|\\\\s)(${escapedTitle})(|$)`, 'i' );\n\n\t// Remove text in parentheses along with the parentheses\n\textract = extract.replace( /\\s+/, ' ' ); // Remove extra white spaces\n\n\t// Make title bold in the extract text\n\t// As the extract is html escaped there can be no such string in it\n\t// Also, the title is escaped of RegExp elements thus can't have \"*\"\n\textract = extract.replace(\n\t\tregExp,\n\t\t`$1${snip}${boldIdentifier}$2${snip}$3`\n\t);\n\textract = extract.split( snip );\n\n\textract.forEach( ( part ) => {\n\t\tif ( part.indexOf( boldIdentifier ) === 0 ) {\n\t\t\telements.push( $( '<b>' )\n\t\t\t\t.text( part.substring( boldIdentifier.length ) ) );\n\t\t} else {\n\t\t\telements.push( document.createTextNode( part ) );\n\t\t}\n\t} );\n\n\treturn elements;\n}\n","/**\n * @module gateway/mediawiki\n */\n\nimport { createModel } from '../preview/model';\nimport * as formatter from '../formatter';\n\n// Public and private cache lifetime (5 minutes)\n//\n// FIXME: Move this to src/constants.js.\nconst CACHE_LIFETIME = 300;\n\n/**\n * @typedef {Gateway} MediaWikiGateway\n * @property {function(Object): Object} extractPageFromResponse\n * @property {function(Object): Object} formatPlainTextExtract\n */\n\n/**\n * Creates an instance of the MediaWiki API gateway.\n *\n * @param {mw.Api} api\n * @param {Object} config Configuration that affects the major behavior of the\n *  gateway.\n * @param {number} config.THUMBNAIL_SIZE The length of the major dimension of\n *  the thumbnail.\n * @param {number} config.EXTRACT_LENGTH The maximum length, in characters,\n *  of the extract.\n * @param {string} config.acceptLanguage The accepted language sent in the\n *  header\n * @return {MediaWikiGateway}\n */\nexport default function createMediaWikiApiGateway( api, config ) {\n\tfunction fetch( title ) {\n\t\treturn api.get( {\n\t\t\taction: 'query',\n\t\t\tprop: 'info|extracts|pageimages|revisions|info',\n\t\t\tformatversion: 2,\n\t\t\tredirects: true,\n\t\t\texintro: mw.config.get( 'wgPopupsTextExtractsIntroOnly', true ),\n\t\t\texchars: config.EXTRACT_LENGTH,\n\n\t\t\t// There is an added geometric limit on .mwe-popups-extract\n\t\t\t// so that text does not overflow from the card.\n\t\t\texplaintext: true,\n\t\t\texsectionformat: 'plain',\n\n\t\t\tpiprop: 'thumbnail',\n\t\t\tpithumbsize: config.THUMBNAIL_SIZE,\n\t\t\tpilicense: 'any',\n\t\t\trvprop: 'timestamp',\n\t\t\tinprop: 'url',\n\t\t\ttitles: title,\n\t\t\tsmaxage: CACHE_LIFETIME,\n\t\t\tmaxage: CACHE_LIFETIME,\n\t\t\tuselang: 'content'\n\t\t}, {\n\t\t\theaders: {\n\t\t\t\t'X-Analytics': 'preview=1',\n\t\t\t\t'Accept-Language': config.acceptLanguage\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @param {mw.Title} title\n\t * @return {AbortPromise<PagePreviewModel>}\n\t */\n\tfunction fetchPreviewForTitle( title ) {\n\t\tconst xhr = fetch( title.getPrefixedDb() );\n\t\treturn xhr.then( ( data ) => {\n\t\t\tconst page = extractPageFromResponse( data );\n\t\t\tconst plainTextExtract = formatPlainTextExtract( page );\n\t\t\treturn convertPageToModel( plainTextExtract );\n\t\t} ).promise( {\n\t\t\tabort() {\n\t\t\t\txhr.abort();\n\t\t\t}\n\t\t} );\n\t}\n\n\treturn {\n\t\tfetch,\n\t\textractPageFromResponse,\n\t\tconvertPageToModel,\n\t\tfetchPreviewForTitle,\n\t\tformatPlainTextExtract\n\t};\n}\n\n/**\n * Extracts page data from the API response.\n *\n * @method\n * @name MediaWikiGateway#extractPageFromResponse\n * @param {Object} data The response\n * @throws {Error} If the response is empty or doesn't contain data about the\n *  page\n * @return {Object}\n */\nfunction extractPageFromResponse( data ) {\n\tif (\n\t\tdata.query &&\n\t\tdata.query.pages &&\n\t\tdata.query.pages.length\n\t) {\n\t\treturn data.query.pages[ 0 ];\n\t}\n\n\tthrow new Error( 'API response `query.pages` is empty.' );\n}\n\n/**\n * Make plain text nicer by applying formatter.\n *\n * @method\n * @name MediaWikiGateway#formatPlainTextExtract\n * @param {Object} data The response\n * @return {Object}\n */\nfunction formatPlainTextExtract( data ) {\n\tconst result = $.extend( {}, data );\n\tresult.extract = formatter.formatPlainTextExtract( data.extract, data.title );\n\treturn result;\n}\n\n/**\n * Converts the API response to a preview model.\n *\n * @method\n * @name MediaWikiGateway#convertPageToModel\n * @param {Object} page\n * @return {PagePreviewModel}\n */\nfunction convertPageToModel( page ) {\n\treturn createModel(\n\t\tpage.title,\n\t\tpage.canonicalurl,\n\t\tpage.pagelanguagehtmlcode,\n\t\tpage.pagelanguagedir,\n\t\tpage.extract,\n\t\tpage.type,\n\t\tpage.thumbnail,\n\t\tpage.pageid\n\t);\n}\n","/**\n * @module gateway/rest\n */\n\nimport { createModel } from '../preview/model';\n\nconst RESTBASE_PROFILE = 'https://www.mediawiki.org/wiki/Specs/Summary/1.2.0';\n\n/** @typedef {function(JQuery.AjaxSettings=): JQuery.jqXHR} Ajax */\n\n/**\n * Creates an instance of the RESTBase gateway.\n *\n * This gateway differs from the {@link MediaWikiGateway MediaWiki gateway} in\n * that it fetches page data from [the RESTBase page summary endpoint][0].\n *\n * [0]: https://en.wikipedia.org/api/rest_v1/#!/Page_content/get_page_summary_title\n *\n * @param {Ajax} ajax A function with the same signature as `jQuery.ajax`\n * @param {Object} config Configuration that affects the major behavior of the\n *  gateway.\n * @param {Function} extractParser A function that takes response and returns\n *  parsed extract\n * @return {Gateway}\n */\nexport default function createRESTBaseGateway( ajax, config, extractParser ) {\n\t/**\n\t * Fetches page data from [the RESTBase page summary endpoint][0].\n\t *\n\t * [0]: https://en.wikipedia.org/api/rest_v1/#!/Page_content/get_page_summary_title\n\t *\n\t * @method\n\t * @name RESTBaseGateway#fetch\n\t * @param {string} title\n\t * @return {JQuery.jqXHR}\n\t */\n\tfunction fetch( title ) {\n\t\tconst endpoint = config.endpoint;\n\n\t\treturn ajax( {\n\t\t\turl: endpoint + encodeURIComponent( title ),\n\t\t\theaders: {\n\t\t\t\tAccept: `application/json; charset=utf-8; profile=\"${RESTBASE_PROFILE}\"`,\n\t\t\t\t'Accept-Language': config.acceptLanguage\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @param {mw.Title} title\n\t * @return {AbortPromise<PagePreviewModel>}\n\t */\n\tfunction fetchPreviewForTitle( title ) {\n\t\tconst titleText = title.getPrefixedDb(),\n\t\t\txhr = fetch( titleText );\n\t\treturn xhr.then( ( page ) => {\n\t\t\t// Endpoint response may be empty or simply missing a title.\n\t\t\tif ( !page || !page.title ) {\n\t\t\t\tpage = $.extend( true, page || {}, { title: titleText } );\n\t\t\t}\n\t\t\t// And extract may be omitted if empty string\n\t\t\tif ( page.extract === undefined ) {\n\t\t\t\tpage.extract = '';\n\t\t\t}\n\t\t\treturn convertPageToModel(\n\t\t\t\tpage, config.THUMBNAIL_SIZE, extractParser\n\t\t\t);\n\t\t} ).catch( ( jqXHR, textStatus, errorThrown ) => {\n\t\t\t// The client will choose how to handle these errors which may include\n\t\t\t// those due to HTTP 4xx and 5xx status. The rejection typing matches\n\t\t\t// fetch failures.\n\t\t\treturn $.Deferred().reject( 'http', {\n\t\t\t\txhr: jqXHR,\n\t\t\t\ttextStatus,\n\t\t\t\texception: errorThrown\n\t\t\t} );\n\t\t} ).promise( { abort() { xhr.abort(); } } );\n\t}\n\n\treturn {\n\t\tfetch,\n\t\tconvertPageToModel,\n\t\tfetchPreviewForTitle\n\t};\n}\n\n/**\n * Checks whether the `originalImage` property contains an image\n * format that's safe to render.\n * https://www.mediawiki.org/wiki/Help:Images#Supported_media_types_for_images\n *\n * @param {string} filename\n *\n * @return {boolean}\n */\nfunction isSafeImgFormat( filename ) {\n\tconst safeImage = new RegExp( /\\.(jpg|jpeg|png|gif)$/i );\n\treturn safeImage.test( filename );\n}\n\n/**\n * Resizes the thumbnail to the requested width, preserving its aspect ratio.\n *\n * The requested width is limited to that of the original image unless the image\n * is an SVG, which can be scaled infinitely.\n *\n * This function is only intended to mangle the pretty thumbnail URLs used on\n * Wikimedia Commons. Once [an official thumb API](https://phabricator.wikimedia.org/T66214)\n * is fully specified and implemented, this function can be made more general.\n *\n * @param {Object} thumbnail The thumbnail image\n * @param {Object} original The original image\n * @param {number} thumbSize The requested size\n * @return {{source: string, width: number, height: number}|undefined}\n */\nfunction generateThumbnailData( thumbnail, original, thumbSize ) {\n\tconst parts = thumbnail.source.split( '/' ),\n\t\tlastPart = parts[ parts.length - 1 ],\n\t\toriginalIsSafe = isSafeImgFormat( original.source ) || undefined;\n\n\t// The last part, the thumbnail's full filename, is in the following form:\n\t// ${width}px-${filename}.${extension}. Splitting the thumbnail's filename\n\t// makes this function resilient to the thumbnail not having the same\n\t// extension as the original image, which is definitely the case for SVG's\n\t// where the thumbnail's extension is .svg.png.\n\tconst filenamePxIndex = lastPart.indexOf( 'px-' );\n\tif ( filenamePxIndex === -1 ) {\n\t\t// The thumbnail size is not customizable. Presumably, RESTBase requested a\n\t\t// width greater than the original and so MediaWiki returned the original's\n\t\t// URL instead of a thumbnail compatible URL. An original URL does not have\n\t\t// a \"thumb\" path, e.g.:\n\t\t//\n\t\t//   https://upload.wikimedia.org/wikipedia/commons/a/aa/Red_Giant_Earth_warm.jpg\n\t\t//\n\t\t// Instead of:\n\t\t//\n\t\t//   https://upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Red_Giant_Earth_warm.jpg/512px-Red_Giant_Earth_warm.jpg\n\t\t//\n\t\t// Use the original if it's a supported image format.\n\t\treturn originalIsSafe && original;\n\t}\n\tconst filename = lastPart.substr( filenamePxIndex + 3 );\n\n\t// Scale the thumbnail's largest dimension.\n\tlet width, height;\n\tif ( thumbnail.width > thumbnail.height ) {\n\t\twidth = thumbSize;\n\t\theight = Math.floor( ( thumbSize / thumbnail.width ) * thumbnail.height );\n\t} else {\n\t\twidth = Math.floor( ( thumbSize / thumbnail.height ) * thumbnail.width );\n\t\theight = thumbSize;\n\t}\n\n\t// If the image isn't an SVG, then it shouldn't be scaled past its original\n\t// dimensions.\n\tif ( width >= original.width && filename.indexOf( '.svg' ) === -1 ) {\n\t\t// if the image format is not supported, it shouldn't be rendered.\n\t\treturn originalIsSafe && original;\n\t}\n\n\tparts[ parts.length - 1 ] = `${width}px-${filename}`;\n\n\treturn {\n\t\tsource: parts.join( '/' ),\n\t\twidth,\n\t\theight\n\t};\n}\n\n/**\n * Converts the API response to a preview model.\n *\n * @method\n * @name RESTBaseGateway#convertPageToModel\n * @param {Object} page\n * @param {number} thumbSize\n * @param {Function} extractParser\n * @return {PagePreviewModel}\n */\nexport function convertPageToModel( page, thumbSize, extractParser ) {\n\treturn createModel(\n\t\tpage.title,\n\t\tnew mw.Title( page.title ).getUrl(),\n\t\tpage.lang,\n\t\tpage.dir,\n\t\textractParser( page ),\n\t\tpage.type,\n\t\tpage.thumbnail ?\n\t\t\tgenerateThumbnailData(\n\t\t\t\tpage.thumbnail, page.originalimage, thumbSize\n\t\t\t) : undefined,\n\t\tpage.pageid\n\t);\n}\n","import * as formatter from '../formatter';\n\n/**\n * Prepare extract\n *\n * @param {Object} page Rest response\n * @return {Array} An array of DOM Elements\n */\nexport function parseHTMLResponse( page ) {\n\tconst extract = page.extract_html;\n\n\treturn extract.length === 0 ? [] : $.parseHTML( extract );\n}\n\n/**\n * Prepare extract\n *\n * @param {Object} page Rest response\n * @return {Array} An array of DOM Elements\n */\nexport function parsePlainTextResponse( page ) {\n\treturn formatter.formatPlainTextExtract( page.extract, page.title );\n}\n","/**\n * @module gateway/page\n */\n\nimport constants from '../constants';\nimport createMediaWikiApiGateway from './mediawiki';\nimport createRESTBaseGateway from './rest';\nimport * as formatters from './restFormatters';\n\n/**\n * Creates a page preview gateway with sensible values for the dependencies.\n *\n * @param {mw.Map} config\n * @return {Gateway}\n */\nexport default function createPagePreviewGateway( config ) {\n\tconst gatewayConfig = $.extend( {}, constants, {\n\t\tacceptLanguage: config.get( 'wgPageContentLanguage' )\n\t} );\n\tconst restConfig = $.extend( {}, gatewayConfig, {\n\t\tendpoint: config.get( 'wgPopupsRestGatewayEndpoint' )\n\t} );\n\tswitch ( config.get( 'wgPopupsGateway' ) ) {\n\t\tcase 'mwApiPlain':\n\t\t\treturn createMediaWikiApiGateway( new mw.Api(), gatewayConfig );\n\t\tcase 'restbasePlain':\n\t\t\treturn createRESTBaseGateway(\n\t\t\t\t$.ajax, restConfig, formatters.parsePlainTextResponse );\n\t\tcase 'restbaseHTML':\n\t\t\treturn createRESTBaseGateway(\n\t\t\t\t$.ajax, restConfig, formatters.parseHTMLResponse );\n\t\tdefault:\n\t\t\tthrow new Error( 'Unknown gateway' );\n\t}\n}\n","/**\n * @module gateway/reference\n */\n\nimport { previewTypes } from '../preview/model';\n\n/**\n * @return {Gateway}\n */\nexport default function createReferenceGateway() {\n\n\tfunction scrapeReferenceText( id ) {\n\t\tconst idSelector = `#${$.escapeSelector( id )}`;\n\n\t\t/**\n\t\t * Same alternative selectors with and without mw-… as in the RESTbased endpoint.\n\t\t *\n\t\t * @see https://phabricator.wikimedia.org/diffusion/GMOA/browse/master/lib/transformations/references/structureReferenceListContent.js$138\n\t\t */\n\t\treturn $( `${idSelector} .mw-reference-text, ${idSelector} .reference-text` );\n\t}\n\n\t/**\n\t * Attempts to find a single reference type identifier, limited to a list of known types.\n\t * - When a `class=\"…\"` attribute mentions multiple known types, the last one is used, following\n\t *   CSS semantics.\n\t * - When there are multiple <cite> tags, the first with a known type is used.\n\t *\n\t * @param {JQuery} $referenceText\n\t * @return {string|null}\n\t */\n\tfunction scrapeReferenceType( $referenceText ) {\n\t\tconst KNOWN_TYPES = [ 'book', 'journal', 'news', 'note', 'web' ];\n\t\tlet type = null;\n\t\t$referenceText.find( 'cite[class]' ).each( ( index, element ) => {\n\t\t\tconst classNames = element.className.split( /\\s+/ );\n\t\t\tfor ( let i = classNames.length; i--; ) {\n\t\t\t\tif ( KNOWN_TYPES.indexOf( classNames[ i ] ) !== -1 ) {\n\t\t\t\t\ttype = classNames[ i ];\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t\treturn type;\n\t}\n\n\t/**\n\t * @param {mw.Title} title\n\t * @param {Element} el\n\t * @return {AbortPromise<ReferencePreviewModel>}\n\t */\n\tfunction fetchPreviewForTitle( title, el ) {\n\t\t// Need to encode the fragment again as mw.Title returns it as decoded text\n\t\tconst id = title.getFragment().replace( / /g, '_' ),\n\t\t\t$referenceText = scrapeReferenceText( id );\n\n\t\tif ( !$referenceText.length ||\n\t\t\t// Skip references that don't contain anything but whitespace, e.g. a single &nbsp;\n\t\t\t( !$referenceText.text().trim() && !$referenceText.children().length )\n\t\t) {\n\t\t\treturn $.Deferred().reject(\n\t\t\t\t'Footnote not found',\n\t\t\t\t// Required to set `showNullPreview` to false and not open an error popup\n\t\t\t\t{ textStatus: 'abort', xhr: { readyState: 0 } }\n\t\t\t).promise( { abort() {} } );\n\t\t}\n\n\t\tconst model = {\n\t\t\turl: `#${id}`,\n\t\t\textract: $referenceText.html(),\n\t\t\ttype: previewTypes.TYPE_REFERENCE,\n\t\t\treferenceType: scrapeReferenceType( $referenceText ),\n\t\t\tsourceElementId: el && el.parentNode && el.parentNode.id\n\t\t};\n\n\t\treturn $.Deferred().resolve( model ).promise( { abort() {} } );\n\t}\n\n\treturn {\n\t\tfetchPreviewForTitle\n\t};\n}\n","/**\n * @module userSettings\n */\n\n/**\n * @interface UserSettings\n *\n * @global\n */\n\nconst IS_ENABLED_KEY = 'mwe-popups-enabled',\n\tPREVIEW_COUNT_KEY = 'ext.popups.core.previewCount';\n\n/**\n * Creates an object whose methods encapsulate all interactions with the UA's\n * storage.\n *\n * @param {Object} storage The `mw.storage` singleton instance\n *\n * @return {UserSettings}\n */\nexport default function createUserSettings( storage ) {\n\treturn {\n\t\t/**\n\t\t * Gets whether the user has previously enabled Page Previews.\n\t\t *\n\t\t * N.B. that if the user hasn't previously enabled or disabled Page\n\t\t * Previews, i.e. userSettings.setIsEnabled(true), then they are treated as\n\t\t * if they have enabled them.\n\t\t *\n\t\t * @method\n\t\t * @name UserSettings#getIsEnabled\n\t\t * @return {boolean}\n\t\t */\n\t\tgetIsEnabled() {\n\t\t\treturn storage.get( IS_ENABLED_KEY ) !== '0';\n\t\t},\n\n\t\t/**\n\t\t * Sets whether the user has enabled Page Previews.\n\t\t *\n\t\t * @method\n\t\t * @name UserSettings#setIsEnabled\n\t\t * @param {boolean} isEnabled\n\t\t * @return {void}\n\t\t */\n\t\tsetIsEnabled( isEnabled ) {\n\t\t\tstorage.set( IS_ENABLED_KEY, isEnabled ? '1' : '0' );\n\t\t},\n\n\t\t/**\n\t\t * Gets whether the user has previously enabled **or disabled** Page\n\t\t * Previews.\n\t\t *\n\t\t * @method\n\t\t * @name UserSettings#hasIsEnabled\n\t\t * @return {boolean}\n\t\t */\n\t\thasIsEnabled() {\n\t\t\tconst value = storage.get( IS_ENABLED_KEY );\n\n\t\t\treturn Boolean( value ) !== false;\n\t\t},\n\n\t\t/**\n\t\t * Gets the number of previews that the user has seen.\n\t\t *\n\t\t * - If the storage isn't available, then -1 is returned.\n\t\t * - If the value in storage is not a number it will override stored value\n\t\t *   to 0\n\t\t *\n\t\t * @method\n\t\t * @name UserSettings#getPreviewCount\n\t\t * @return {number}\n\t\t */\n\t\tgetPreviewCount() {\n\t\t\tconst result = storage.get( PREVIEW_COUNT_KEY );\n\n\t\t\tif ( result === false ) {\n\t\t\t\treturn -1;\n\t\t\t} else if ( result === null ) {\n\t\t\t\treturn 0;\n\t\t\t}\n\t\t\tlet count = parseInt( result, 10 );\n\n\t\t\t// stored number is not a zero, override it to zero and store new value\n\t\t\tif ( isNaN( count ) ) {\n\t\t\t\tcount = 0;\n\t\t\t\tthis.setPreviewCount( count );\n\t\t\t}\n\t\t\treturn count;\n\t\t},\n\n\t\t/**\n\t\t * Sets the number of previews that the user has seen.\n\t\t *\n\t\t * @method\n\t\t * @name UserSettings#setPreviewCount\n\t\t * @param {number} count\n\t\t * @return {void}\n\t\t */\n\t\tsetPreviewCount( count ) {\n\t\t\tstorage.set( PREVIEW_COUNT_KEY, count.toString() );\n\t\t}\n\t};\n}\n","/**\n * @module templateUtil\n */\n\n/**\n * @param {string} str\n * @return {string} The string with any HTML entities escaped.\n */\nexport function escapeHTML( str ) {\n\treturn mw.html.escape( str );\n}\n\nconst templates = {};\n/**\n * @param {string} html markup of the template\n * @return {Element} a cloned root element of the template\n */\nexport function createNodeFromTemplate( html ) {\n\tif ( !templates[ html ] ) {\n\t\t// TODO: use <template> element when IE11 dies\n\t\tconst div = document.createElement( 'div' );\n\t\tdiv.innerHTML = html;\n\t\ttemplates[ html ] = div.firstElementChild;\n\t}\n\n\treturn templates[ html ].cloneNode( true );\n}\n","/**\n * @module settingsDialog\n */\n\nimport { escapeHTML } from '../templateUtil';\n\n/**\n * @typedef {Object} SettingsModel\n * @property {string} heading\n * @property {string} closeLabel\n * @property {string} saveLabel\n * @property {string} helpText\n * @property {string} okLabel\n * @property {SettingsChoiceModel[]} [choices]\n *\n * @global\n */\n\n/**\n * @typedef {Object} SettingsChoiceModel\n * @property {string} id Portion of the elements' IDs and value of the input.\n * @property {string} name\n * @property {string} [description]\n * @property {boolean} [isChecked] Whether the setting is checked.\n *\n * @global\n */\n\n/**\n * @param {SettingsChoiceModel[]} [choices]\n * @return {SettingsChoiceModel}\n */\nfunction escapeChoices( choices = [] ) {\n\treturn choices.map(\n\t\t( { id, name, description, isChecked } ) =>\n\t\t\t( {\n\t\t\t\tid: escapeHTML( id ),\n\t\t\t\tname: escapeHTML( name ),\n\t\t\t\tdescription: description ? escapeHTML( description ) : '',\n\t\t\t\tisChecked\n\t\t\t} )\n\t);\n}\n\n/**\n * @param {SettingsModel} model\n * @return {JQuery}\n */\nexport function renderSettingsDialog( model ) {\n\tconst heading = escapeHTML( model.heading ),\n\t\tsaveLabel = escapeHTML( model.saveLabel ),\n\t\tcloseLabel = escapeHTML( model.closeLabel ),\n\t\thelpText = escapeHTML( model.helpText ),\n\t\tokLabel = escapeHTML( model.okLabel ),\n\t\tchoices = escapeChoices( model.choices );\n\treturn $( $.parseHTML( `\n\t\t<section id='mwe-popups-settings'>\n\t\t\t<header>\n\t\t\t\t<div>\n\t\t\t\t\t<div class='mw-ui-icon mw-ui-icon-element mw-ui-icon-popups-close close'>${closeLabel}</div>\n\t\t\t\t</div>\n\t\t\t\t<h1>${heading}</h1>\n\t\t\t\t<div>\n\t\t\t\t\t<button class='save mw-ui-button mw-ui-progressive'>${saveLabel}</button>\n\t\t\t\t\t<button class='okay mw-ui-button mw-ui-progressive' style='display:none;'>${okLabel}</button>\n\t\t\t\t</div>\n\t\t\t</header>\n\t\t\t<main id='mwe-popups-settings-form'>\n\t\t\t\t<form>\n\t\t\t\t\t${choices.map( ( { id, name, description, isChecked } ) => `\n\t\t\t\t\t<p>\n\t\t\t\t\t\t<input\n\t\t\t\t\t\t\tname='mwe-popups-setting'\n\t\t\t\t\t\t\t${isChecked ? 'checked' : ''}\n\t\t\t\t\t\t\tvalue='${id}'\n\t\t\t\t\t\t\ttype='radio'\n\t\t\t\t\t\t\tid='mwe-popups-settings-${id}'>\n\t\t\t\t\t\t<label for='mwe-popups-settings-${id}'>\n\t\t\t\t\t\t\t<span>${name}</span>\n\t\t\t\t\t\t\t${description}\n\t\t\t\t\t\t</label>\n\t\t\t\t\t</p>` ).join( '' )}\n\t\t\t\t</form>\n\t\t\t</main>\n\t\t\t<div class='mwe-popups-settings-help' style='display:none;'>\n\t\t\t\t<div class=\"mw-ui-icon mw-ui-icon-element mw-ui-icon-footer\"></div>\n\t\t\t\t<p>${helpText}</p>\n\t\t\t</div>\n\t\t</section>\n\t`.trim() ) );\n}\n","/**\n * @module settingsDialogRenderer\n */\n\nimport { createSettingsDialog } from './settingsDialog';\n\n/**\n * Creates a render function that will create the settings dialog and return\n * a set of methods to operate on it\n *\n * @param {mw.Map} config\n * @return {Function} render function\n */\nexport default function createSettingsDialogRenderer( config ) {\n\t/**\n\t * Cached settings dialog\n\t *\n\t * @type {JQuery}\n\t */\n\tlet $dialog,\n\t\t/**\n\t\t * Cached settings overlay\n\t\t *\n\t\t * @type {JQuery}\n\t\t */\n\t\t$overlay;\n\n\t/**\n\t * Renders the relevant form and labels in the settings dialog\n\t *\n\t * @param {Object} boundActions\n\t * @return {Object} object with methods to affect the rendered UI\n\t */\n\treturn ( boundActions ) => {\n\t\tif ( !$dialog ) {\n\t\t\t$dialog = createSettingsDialog( isNavPopupsEnabled(), config.get( 'wgPopupsReferencePreviewsBeta' ) );\n\t\t\t$overlay = $( '<div>' ).addClass( 'mwe-popups-overlay' );\n\n\t\t\t// Setup event bindings\n\n\t\t\t$dialog.find( '.save' ).on( 'click', () => {\n\t\t\t\t// Find the selected value (simple|advanced|off)\n\t\t\t\tconst selected = getSelectedSetting( $dialog ),\n\t\t\t\t\t// Only simple means enabled, advanced is disabled in favor of\n\t\t\t\t\t// NavPops and off means disabled.\n\t\t\t\t\tenabled = selected === 'simple';\n\n\t\t\t\tboundActions.saveSettings( enabled );\n\t\t\t} );\n\t\t\t$dialog.find( '.close, .okay' ).on( 'click', boundActions.hideSettings );\n\t\t}\n\n\t\treturn {\n\t\t\t/**\n\t\t\t * Append the dialog and overlay to a DOM element\n\t\t\t *\n\t\t\t * @param {HTMLElement} el\n\t\t\t * @return {void}\n\t\t\t */\n\t\t\tappendTo( el ) {\n\t\t\t\t$overlay.appendTo( el );\n\t\t\t\t$dialog.appendTo( $overlay );\n\t\t\t},\n\n\t\t\t/**\n\t\t\t * Show the settings element and position it correctly\n\t\t\t *\n\t\t\t * @return {void}\n\t\t\t */\n\t\t\tshow() {\n\t\t\t\t$overlay.show();\n\t\t\t},\n\n\t\t\t/**\n\t\t\t * Hide the settings dialog.\n\t\t\t *\n\t\t\t * @return {void}\n\t\t\t */\n\t\t\thide() {\n\t\t\t\t$overlay.hide();\n\t\t\t},\n\n\t\t\t/**\n\t\t\t * Toggle the help dialog on or off\n\t\t\t *\n\t\t\t * @param {boolean} visible if you want to show or hide the help dialog\n\t\t\t * @return {void}\n\t\t\t */\n\t\t\ttoggleHelp( visible ) {\n\t\t\t\ttoggleHelp( $dialog, visible );\n\t\t\t},\n\n\t\t\t/**\n\t\t\t * Update the form depending on the enabled flag\n\t\t\t *\n\t\t\t * If false and no navpops, then checks 'off'\n\t\t\t * If true, then checks 'on'\n\t\t\t * If false, and there are navpops, then checks 'advanced'\n\t\t\t *\n\t\t\t * @param {boolean} enabled if page previews are enabled\n\t\t\t * @return {void}\n\t\t\t */\n\t\t\tsetEnabled( enabled ) {\n\t\t\t\tlet name = 'off';\n\t\t\t\tif ( enabled ) {\n\t\t\t\t\tname = 'simple';\n\t\t\t\t} else if ( isNavPopupsEnabled() ) {\n\t\t\t\t\tname = 'advanced';\n\t\t\t\t}\n\n\t\t\t\t// Check the appropriate radio button\n\t\t\t\t$dialog.find( `#mwe-popups-settings-${name}` )\n\t\t\t\t\t.prop( 'checked', true );\n\t\t\t}\n\t\t};\n\t};\n}\n\n/**\n * Get the selected value on the radio button\n *\n * @param {JQuery.Object} $el the element to extract the setting from\n * @return {string} Which should be (simple|advanced|off)\n */\nfunction getSelectedSetting( $el ) {\n\treturn $el.find(\n\t\t'input[name=mwe-popups-setting]:checked, #mwe-popups-settings'\n\t).val();\n}\n\n/**\n * Toggles the visibility between a form and the help\n *\n * @param {JQuery.Object} $el element that contains form and help\n * @param {boolean} visible if the help should be visible, or the form\n * @return {void}\n */\nfunction toggleHelp( $el, visible ) {\n\t// eslint-disable-next-line no-jquery/no-global-selector\n\tconst $dialog = $( '#mwe-popups-settings' ),\n\t\tformSelectors = 'main, .save, .close',\n\t\thelpSelectors = '.mwe-popups-settings-help, .okay';\n\n\tif ( visible ) {\n\t\t$dialog.find( formSelectors ).hide();\n\t\t$dialog.find( helpSelectors ).show();\n\t} else {\n\t\t$dialog.find( formSelectors ).show();\n\t\t$dialog.find( helpSelectors ).hide();\n\t}\n}\n\n/**\n * Checks if the NavigationPopups gadget is enabled by looking at the global\n * variables\n *\n * @return {boolean} if navpops was found to be enabled\n */\nfunction isNavPopupsEnabled() {\n\t/* global pg */\n\treturn typeof pg !== 'undefined' && pg.fn.disablePopups !== undefined;\n}\n","/**\n * @module settingsDialog\n */\n\nimport { renderSettingsDialog } from './templates/settingsDialog/settingsDialog';\n\n/**\n * Create the settings dialog shown to anonymous users.\n *\n * @param {boolean} navPopupsEnabled\n * @param {boolean} isReferencePreviewsInBeta\n * @return {JQuery} settings dialog\n */\nexport function createSettingsDialog( navPopupsEnabled, isReferencePreviewsInBeta ) {\n\tconst choices = [\n\t\t{\n\t\t\tid: 'simple',\n\t\t\tname: mw.msg( 'popups-settings-option-simple' ),\n\t\t\tdescription: mw.msg(\n\t\t\t\t// TODO: Remove when not in Beta any more\n\t\t\t\tisReferencePreviewsInBeta ?\n\t\t\t\t\t'popups-settings-option-simple-description' :\n\t\t\t\t\t'popups-settings-option-unified-description'\n\t\t\t),\n\t\t\tisChecked: true\n\t\t},\n\t\t{\n\t\t\tid: 'advanced',\n\t\t\tname: mw.msg( 'popups-settings-option-advanced' ),\n\t\t\tdescription: mw.msg( 'popups-settings-option-advanced-description' )\n\t\t},\n\t\t{\n\t\t\tid: 'off',\n\t\t\tname: mw.msg( 'popups-settings-option-off' )\n\t\t}\n\t];\n\n\tif ( !navPopupsEnabled ) {\n\t\t// remove the advanced option\n\t\tchoices.splice( 1, 1 );\n\t}\n\n\treturn renderSettingsDialog( {\n\t\theading: mw.msg(\n\t\t\t// TODO: Remove when not in Beta any more\n\t\t\tisReferencePreviewsInBeta ?\n\t\t\t\t'popups-settings-title' :\n\t\t\t\t'popups-settings-unified-title'\n\t\t),\n\t\tcloseLabel: mw.msg( 'popups-settings-cancel' ),\n\t\tsaveLabel: mw.msg( 'popups-settings-save' ),\n\t\thelpText: mw.msg( 'popups-settings-help' ),\n\t\tokLabel: mw.msg( 'popups-settings-help-ok' ),\n\t\tchoices\n\t} );\n}\n","/**\n * @module changeListener\n */\n\n/**\n * @typedef {Function} ext.popups.ChangeListener\n * @param {Object} prevState The previous state\n * @param {Object} state The current state\n */\n\n/**\n * Registers a change listener, which is bound to the\n * [store](http://redux.js.org/docs/api/Store.html).\n *\n * A change listener is a function that is only invoked when the state in the\n * [store](http://redux.js.org/docs/api/Store.html) changes. N.B. that there\n * may not be a 1:1 correspondence with actions being dispatched to the store\n * and the state in the store changing.\n *\n * See [Store#subscribe](http://redux.js.org/docs/api/Store.html#subscribe)\n * for more information about what change listeners may and may not do.\n *\n * @param {Redux.Store} store\n * @param {ext.popups.ChangeListener} callback\n * @return {void}\n */\nexport default function registerChangeListener( store, callback ) {\n\t// This function is based on the example in [the documentation for\n\t// Store#subscribe](http://redux.js.org/docs/api/Store.html#subscribe),\n\t// which was written by Dan Abramov.\n\n\tlet state;\n\n\tstore.subscribe( () => {\n\t\tconst prevState = state;\n\n\t\tstate = store.getState();\n\n\t\tif ( prevState !== state ) {\n\t\t\tcallback( prevState, state );\n\t\t}\n\t} );\n}\n","/**\n * @module title\n */\n\n/**\n * Fast, native check if we are parsing a self-link, with the only difference beeing the hash.\n *\n * @param {HTMLAnchorElement} el\n * @return {boolean}\n */\nfunction isOwnPageAnchorLink( el ) {\n\treturn el.hash &&\n\t\t// Note: The protocol is ignored for the sake of simplicity.\n\t\t// Can't compare username and password because they aren't readable from `location`.\n\t\tel.host === location.host &&\n\t\tel.pathname === location.pathname &&\n\t\tel.search === location.search;\n}\n\n/**\n * Gets the title of a local page from an href given some configuration.\n *\n * @param {string} href\n * @param {mw.Map} config\n * @return {string|undefined}\n */\nexport function getTitle( href, config ) {\n\t// Skip every URI that mw.Uri cannot parse\n\tlet linkHref;\n\ttry {\n\t\tlinkHref = new mw.Uri( href );\n\t} catch ( e ) {\n\t\treturn undefined;\n\t}\n\n\t// External links\n\tif ( linkHref.host !== location.hostname ) {\n\t\treturn undefined;\n\t}\n\n\tconst queryLength = Object.keys( linkHref.query ).length;\n\tlet title;\n\n\t// No query params (pretty URL)\n\tif ( !queryLength ) {\n\t\tconst pattern = mw.util.escapeRegExp( config.get( 'wgArticlePath' ) ).replace( '\\\\$1', '([^?#]+)' ),\n\t\t\tmatches = new RegExp( pattern ).exec( linkHref.path );\n\n\t\t// We can't be sure decodeURIComponent() is able to parse every possible match\n\t\ttry {\n\t\t\ttitle = matches && decodeURIComponent( matches[ 1 ] );\n\t\t} catch ( e ) {\n\t\t\t// Will return undefined below\n\t\t}\n\t} else if ( queryLength === 1 && 'title' in linkHref.query ) {\n\t\t// URL is not pretty, but only has a `title` parameter\n\t\ttitle = linkHref.query.title;\n\t}\n\n\treturn title ? `${title}${linkHref.fragment ? `#${linkHref.fragment}` : ''}` : undefined;\n}\n\n/**\n * Given a page title it will return the mediawiki.Title if it is an eligible\n * link for showing page previews, null otherwise\n *\n * @param {string|undefined} title page title to check if it should show preview\n * @param {number[]} contentNamespaces contentNamespaces as specified in\n * wgContentNamespaces\n * @return {mw.Title|null}\n */\nexport function isValid( title, contentNamespaces ) {\n\tif ( !title ) {\n\t\treturn null;\n\t}\n\n\t// Is title in a content namespace?\n\tconst mwTitle = mw.Title.newFromText( title );\n\tif ( mwTitle && contentNamespaces.indexOf( mwTitle.namespace ) >= 0 ) {\n\t\treturn mwTitle;\n\t}\n\n\treturn null;\n}\n\n/**\n * Return an mw.Title from an HTMLAnchorElement if valid for page previews. Convenience\n * method\n *\n * @param {HTMLAnchorElement} el\n * @param {mw.Map} config\n * @return {mw.Title|null}\n */\nexport function fromElement( el, config ) {\n\tif ( isOwnPageAnchorLink( el ) ) {\n\t\t// No need to check the namespace. A self-link can't point to different one.\n\t\ttry {\n\t\t\treturn mw.Title.newFromText( config.get( 'wgPageName' ) + decodeURIComponent( el.hash ) );\n\t\t} catch ( e ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn isValid(\n\t\tgetTitle( el.href, config ),\n\t\tconfig.get( 'wgContentNamespaces' )\n\t);\n}\n","/**\n * @module wait\n */\n\n/**\n * Sugar around `window.setTimeout`.\n *\n * @example\n * import wait from './wait';\n *\n * wait( 150 )\n *   .then( () => {\n *     // Continue processing...\n *   } );\n *\n * @param {number} delay The number of milliseconds to wait\n * @return {jQuery.Promise}\n */\nexport default function wait( delay ) {\n\tconst deferred = $.Deferred();\n\tsetTimeout( () => deferred.resolve(), delay );\n\treturn deferred.promise();\n}\n","/**\n * @module thumbnail\n */\n\nimport constants from '../constants';\n\nexport const SIZES = {\n\tportraitImage: {\n\t\th: 250, // Exact height\n\t\tw: 203 // Max width\n\t},\n\tlandscapeImage: {\n\t\th: 200, // Max height\n\t\tw: 320 // Exact Width\n\t}\n};\n\n/**\n * @typedef {Object} ext.popups.Thumbnail\n * @property {JQuery} el\n * @property {boolean} isTall Whether or not the thumbnail is portrait\n * @property {number} width\n * @property {number} height\n * @property {boolean} isNarrow whether the thumbnail is portrait and also\n *  thinner than the default portrait thumbnail width\n *  (as defined in SIZES.portraitImage.w)\n * @property {number} offset in pixels between the thumbnail width and the\n *  standard portrait thumbnail width (as defined in SIZES.portraitImage.w)\n */\n\n/**\n * Creates a thumbnail from the representation of a thumbnail returned by the\n * PageImages MediaWiki API query module.\n *\n * If there's no thumbnail, the thumbnail is too small, or the thumbnail's URL\n * contains characters that could be used to perform an\n * [XSS attack via CSS](https://www.owasp.org/index.php/Testing_for_CSS_Injection_(OTG-CLIENT-005)),\n * then `null` is returned.\n *\n * Extracted from `mw.popups.renderer.article.createThumbnail`.\n *\n * @param {Object} rawThumbnail\n * @param {boolean} useCSSClipPath\n * @return {ext.popups.Thumbnail|null}\n */\nexport function createThumbnail( rawThumbnail, useCSSClipPath ) {\n\tconst devicePixelRatio = constants.BRACKETED_DEVICE_PIXEL_RATIO;\n\n\tif ( !rawThumbnail ) {\n\t\treturn null;\n\t}\n\n\tconst tall = rawThumbnail.width < rawThumbnail.height;\n\tconst thumbWidth = rawThumbnail.width / devicePixelRatio;\n\tconst thumbHeight = rawThumbnail.height / devicePixelRatio;\n\n\tif (\n\t\t// Image too small for landscape display\n\t\t( !tall && thumbWidth < SIZES.landscapeImage.w ) ||\n\t\t// Image too small for portrait display\n\t\t( tall && thumbHeight < SIZES.portraitImage.h ) ||\n\t\t// These characters in URL that could inject CSS and thus JS\n\t\t(\n\t\t\trawThumbnail.source.indexOf( '\\\\' ) > -1 ||\n\t\t\trawThumbnail.source.indexOf( '\\'' ) > -1 ||\n\t\t\trawThumbnail.source.indexOf( '\"' ) > -1\n\t\t)\n\t) {\n\t\treturn null;\n\t}\n\n\tlet x, y, width, height;\n\tif ( tall ) {\n\t\tx = ( thumbWidth > SIZES.portraitImage.w ) ?\n\t\t\t( ( thumbWidth - SIZES.portraitImage.w ) / -2 ) :\n\t\t\t( SIZES.portraitImage.w - thumbWidth );\n\t\ty = ( thumbHeight > SIZES.portraitImage.h ) ?\n\t\t\t( ( thumbHeight - SIZES.portraitImage.h ) / -2 ) : 0;\n\t\twidth = SIZES.portraitImage.w;\n\t\theight = SIZES.portraitImage.h;\n\n\t\t// Special handling for thin tall images\n\t\t// https://phabricator.wikimedia.org/T192928#4312088\n\t\tif ( thumbWidth < width ) {\n\t\t\tx = 0;\n\t\t\twidth = thumbWidth;\n\t\t}\n\t} else {\n\t\tx = 0;\n\t\ty = ( thumbHeight > SIZES.landscapeImage.h ) ?\n\t\t\t( ( thumbHeight - SIZES.landscapeImage.h ) / -2 ) : 0;\n\t\twidth = SIZES.landscapeImage.w;\n\t\theight = ( thumbHeight > SIZES.landscapeImage.h ) ?\n\t\t\tSIZES.landscapeImage.h : thumbHeight;\n\t}\n\n\tconst isNarrow = tall && thumbWidth < SIZES.portraitImage.w;\n\tconst el = useCSSClipPath ? createThumbnailImg( rawThumbnail.source ) : createThumbnailSVG(\n\t\ttall ? 'mwe-popups-is-tall' : 'mwe-popups-is-not-tall',\n\t\trawThumbnail.source,\n\t\tx,\n\t\ty,\n\t\tthumbWidth,\n\t\tthumbHeight,\n\t\twidth,\n\t\theight\n\t);\n\n\treturn {\n\t\tel,\n\t\tisTall: tall,\n\t\tisNarrow,\n\t\toffset: isNarrow ? SIZES.portraitImage.w - thumbWidth : 0,\n\t\twidth: thumbWidth,\n\t\theight: thumbHeight\n\t};\n}\n\nfunction createThumbnailImg( url ) {\n\tconst img = document.createElement( 'img' );\n\timg.className = 'mwe-popups-thumbnail';\n\timg.src = url;\n\treturn img;\n}\n\n/**\n * Creates the SVG image element that represents the thumbnail.\n *\n * This function is distinct from `createThumbnail` as it abstracts away some\n * browser issues that are uncovered when manipulating elements across\n * namespaces.\n *\n * @param {string} className\n * @param {string} url\n * @param {number} x\n * @param {number} y\n * @param {number} thumbnailWidth\n * @param {number} thumbnailHeight\n * @param {number} width\n * @param {number} height\n * @return {JQuery}\n */\n\nexport function createThumbnailSVG(\n\tclassName, url, x, y, thumbnailWidth, thumbnailHeight, width, height\n) {\n\tconst nsSvg = 'http://www.w3.org/2000/svg',\n\t\tnsXlink = 'http://www.w3.org/1999/xlink';\n\n\t// We want to visually separate the image from the summary\n\t// Given we use an SVG mask, we cannot rely on border to do this\n\t// and instead must insert a polyline element to visually separate\n\tconst line = document.createElementNS( nsSvg, 'polyline' );\n\tconst isTall = className.indexOf( 'not-tall' ) === -1;\n\tconst points = isTall ? [ 0, 0, 0, height ] :\n\t\t[ 0, height - 1, width, height - 1 ];\n\n\tline.setAttribute( 'stroke', 'rgba(0,0,0,0.1)' );\n\tline.setAttribute( 'points', points.join( ' ' ) );\n\tline.setAttribute( 'stroke-width', 1 );\n\n\tconst $thumbnailSVGImage = $( document.createElementNS( nsSvg, 'image' ) );\n\t$thumbnailSVGImage[ 0 ].setAttributeNS( nsXlink, 'href', url );\n\t// eslint-disable-next-line mediawiki/class-doc\n\t$thumbnailSVGImage\n\t\t.addClass( className )\n\t\t.attr( {\n\t\t\tx,\n\t\t\ty,\n\t\t\twidth: thumbnailWidth,\n\t\t\theight: thumbnailHeight\n\t\t} );\n\n\tconst $thumbnail = $( document.createElementNS( nsSvg, 'svg' ) )\n\t\t.attr( {\n\t\t\txmlns: nsSvg,\n\t\t\twidth,\n\t\t\theight\n\t\t} )\n\t\t.append( $thumbnailSVGImage );\n\n\t$thumbnail.append( line );\n\treturn $thumbnail;\n}\n","/**\n * @module popup\n */\n\nimport { createNodeFromTemplate } from '../templateUtil';\n\nconst templateHTML = `\n\t<div class=\"mwe-popups\" aria-hidden></div>\n`;\n/**\n * @param {ext.popups.previewTypes} type\n * @param {Element} element The contents of the popup.\n * @return {JQuery}\n */\n\nexport function renderPopup( type, container ) {\n\tconst element = createNodeFromTemplate( templateHTML );\n\t// The following classes are used here:\n\t// * mwe-popups-type-reference\n\t// * mwe-popups-type-unknown\n\t// * mwe-popups-type-generic\n\t// * mwe-popups-type-disambiguation\n\telement.className = `mwe-popups mwe-popups-type-${type}`;\n\tcontainer.className = 'mwe-popups-container';\n\telement.appendChild( container );\n\treturn $( element );\n}\n","/**\n * @module preview\n */\n\nimport { renderPopup } from '../popup/popup';\nimport { createNodeFromTemplate, escapeHTML } from '../templateUtil';\n\nconst templateHTML = `\n\t<div class=\"mwe-popups-container\">\n\t\t<div class=\"mw-ui-icon mw-ui-icon-element\"></div>\n\t\t<strong class=\"mwe-popups-title\"></strong>\n\t\t<a class=\"mwe-popups-extract\">\n\t\t\t<span class=\"mwe-popups-message\"></span>\n\t\t</a>\n\t\t<footer>\n\t\t\t<a class=\"mwe-popups-read-link\"></a>\n\t\t</footer>\n\t</div>\n`;\n\n/**\n * @param {ext.popups.PagePreviewModel} model\n * @param {boolean} showTitle\n * @param {string} extractMsg\n * @param {string} linkMsg\n * @return {JQuery}\n */\nexport function renderPreview(\n\tmodel, showTitle, extractMsg, linkMsg\n) {\n\tconst $popup = renderPopup( model.type, createNodeFromTemplate( templateHTML ) );\n\n\t// The following classes are used here:\n\t// * mw-icon-preview-reference\n\t// * mw-icon-preview-unknown\n\t// * mw-icon-preview-generic\n\t// * mw-icon-preview-disambiguation\n\t$popup.find( '.mw-ui-icon ' ).addClass( `mw-ui-icon-preview-${model.type}` );\n\t$popup.find( '.mwe-popups-extract' ).attr( 'href', model.url );\n\t$popup.find( '.mwe-popups-message' ).html( escapeHTML( extractMsg ) );\n\t$popup.find( '.mwe-popups-read-link' )\n\t\t.html( escapeHTML( linkMsg ) )\n\t\t.attr( 'href', model.url );\n\tif ( showTitle ) {\n\t\t$popup.find( '.mwe-popups-title' ).html( escapeHTML( model.title ) );\n\t} else {\n\t\t$popup.find( '.mwe-popups-title' ).remove();\n\t}\n\n\treturn $popup;\n}\n","/**\n * @module referencePreview\n */\n\nimport { renderPopup } from '../popup/popup';\nimport { createNodeFromTemplate, escapeHTML } from '../templateUtil';\n\nconst templateHTML = `\n<div class=\"mwe-popups-container\">\n    <div class=\"mwe-popups-extract\">\n        <div class=\"mwe-popups-scroll\">\n            <strong class=\"mwe-popups-title\">\n                <span class=\"mw-ui-icon mw-ui-icon-element\"></span>\n                <span class=\"mwe-popups-title-placeholder\"></span>\n            </strong>\n            <div class=\"mw-parser-output\"></div>\n        </div>\n        <div class=\"mwe-popups-fade\"></div>\n    </div>\n\t<footer>\n\t\t<div class=\"mwe-popups-settings\"></div>\n\t</footer>\n</div>`;\n\nconst LOGGING_SCHEMA = 'event.ReferencePreviewsPopups';\nlet isTracking = false;\n$( () => {\n\tif ( mw.config.get( 'wgPopupsReferencePreviews' ) &&\n\t\tnavigator.sendBeacon &&\n\t\tmw.config.get( 'wgIsArticle' ) &&\n\t\t!isTracking\n\t) {\n\t\tisTracking = true;\n\t\tmw.track( LOGGING_SCHEMA, { action: 'pageview' } );\n\t}\n} );\n\n/**\n * @param {ext.popups.ReferencePreviewModel} model\n * @return {JQuery}\n */\nexport function renderReferencePreview(\n\tmodel\n) {\n\tconst type = model.referenceType || 'generic';\n\t// The following messages are used here:\n\t// * popups-refpreview-book\n\t// * popups-refpreview-journal\n\t// * popups-refpreview-news\n\t// * popups-refpreview-note\n\t// * popups-refpreview-web\n\tlet titleMsg = mw.message( `popups-refpreview-${type}` );\n\tif ( !titleMsg.exists() ) {\n\t\ttitleMsg = mw.message( 'popups-refpreview-reference' );\n\t}\n\n\tconst $el = renderPopup( model.type, createNodeFromTemplate( templateHTML ) );\n\t$el.find( '.mwe-popups-title-placeholder' )\n\t\t.replaceWith( escapeHTML( titleMsg.text() ) );\n\t// The following classes are used here:\n\t// * mw-ui-icon-reference-generic\n\t// * mw-ui-icon-reference-book\n\t// * mw-ui-icon-reference-journal\n\t// * mw-ui-icon-reference-news\n\t// * mw-ui-icon-reference-note\n\t// * mw-ui-icon-reference-web\n\t$el.find( '.mwe-popups-title .mw-ui-icon' )\n\t\t.addClass( `mw-ui-icon-reference-${type}` );\n\t$el.find( '.mw-parser-output' )\n\t\t.html( model.extract );\n\n\t// Make sure to not destroy existing targets, if any\n\t$el.find( '.mwe-popups-extract a[href][class~=\"external\"]:not([target])' ).each( ( i, a ) => {\n\t\ta.target = '_blank';\n\t\t// Don't let the external site access and possibly manipulate window.opener.location\n\t\ta.rel = `${a.rel ? `${a.rel} ` : ''}noopener`;\n\t} );\n\n\t// We assume elements that benefit from being collapsible are to large for the popup\n\t$el.find( '.mw-collapsible' ).replaceWith( $( '<div>' )\n\t\t.addClass( 'mwe-collapsible-placeholder' )\n\t\t.append(\n\t\t\t$( '<span>' )\n\t\t\t\t.addClass( 'mw-ui-icon mw-ui-icon-element mw-ui-icon-infoFilled' ),\n\t\t\t$( '<div>' )\n\t\t\t\t.addClass( 'mwe-collapsible-placeholder-label' )\n\t\t\t\t.text( mw.msg( 'popups-refpreview-collapsible-placeholder' ) )\n\t\t)\n\t);\n\n\t// Undo remaining effects from the jquery.tablesorter.js plugin\n\t$el.find( 'table.sortable' ).removeClass( 'sortable jquery-tablesorter' )\n\t\t.find( '.headerSort' ).removeClass( 'headerSort' ).attr( { tabindex: null, title: null } );\n\n\t// TODO: Remove when not in Beta any more\n\tif ( mw.config.get( 'wgPopupsReferencePreviewsBetaFeature' ) !== true ) {\n\t\t// TODO: Do not remove this but move it up into the templateHTML constant!\n\t\t$el.find( '.mwe-popups-settings' ).append(\n\t\t\t$( '<a>' )\n\t\t\t\t.addClass( 'mwe-popups-settings-icon' )\n\t\t\t\t.append(\n\t\t\t\t\t$( '<span>' )\n\t\t\t\t\t\t.addClass( 'mw-ui-icon mw-ui-icon-element mw-ui-icon-small mw-ui-icon-settings' )\n\t\t\t\t)\n\t\t);\n\t} else {\n\t\t// Change the styling when there is no content in the footer (to prevent empty space)\n\t\t$el.find( '.mwe-popups-container' ).addClass( 'footer-empty' );\n\t}\n\n\tif ( isTracking ) {\n\t\t$el.find( '.mw-parser-output' ).on( 'click', 'a', () => {\n\t\t\tmw.track( LOGGING_SCHEMA, {\n\t\t\t\taction: 'clickedReferencePreviewsContentLink'\n\t\t\t} );\n\t\t} );\n\t}\n\n\t$el.find( '.mwe-popups-scroll' ).on( 'scroll', function ( e ) {\n\t\tconst element = e.target,\n\t\t\t// We are dealing with floating point numbers here when the page is zoomed!\n\t\t\tscrolledToBottom = element.scrollTop >= element.scrollHeight - element.clientHeight - 1;\n\n\t\tif ( isTracking ) {\n\t\t\tif ( !element.isOpenRecorded ) {\n\t\t\t\tmw.track( LOGGING_SCHEMA, {\n\t\t\t\t\taction: 'poppedOpen',\n\t\t\t\t\tscrollbarsPresent: element.scrollHeight > element.clientHeight\n\t\t\t\t} );\n\t\t\t\telement.isOpenRecorded = true;\n\t\t\t}\n\n\t\t\tif (\n\t\t\t\telement.scrollTop > 0 &&\n\t\t\t\t!element.isScrollRecorded\n\t\t\t) {\n\t\t\t\tmw.track( LOGGING_SCHEMA, {\n\t\t\t\t\taction: 'scrolled'\n\t\t\t\t} );\n\t\t\t\telement.isScrollRecorded = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( !scrolledToBottom && element.isScrolling ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst $extract = $( element ).parent(),\n\t\t\thasHorizontalScroll = element.scrollWidth > element.clientWidth,\n\t\t\tscrollbarHeight = element.offsetHeight - element.clientHeight,\n\t\t\thasVerticalScroll = element.scrollHeight > element.clientHeight,\n\t\t\tscrollbarWidth = element.offsetWidth - element.clientWidth;\n\t\t$extract.find( '.mwe-popups-fade' ).css( {\n\t\t\tbottom: hasHorizontalScroll ? `${scrollbarHeight}px` : 0,\n\t\t\tright: hasVerticalScroll ? `${scrollbarWidth}px` : 0\n\t\t} );\n\n\t\telement.isScrolling = !scrolledToBottom;\n\t\t$extract.toggleClass( 'mwe-popups-fade-out', element.isScrolling );\n\t} );\n\n\treturn $el;\n}\n","/**\n * @module pagePreview\n */\n\nimport { renderPopup } from '../popup/popup';\nimport { createNodeFromTemplate } from '../templateUtil';\n\nconst defaultExtractWidth = 215;\nconst templateHTML = `\n<div>\n    <a class=\"mwe-popups-discreet\"></a>\n    <a class=\"mwe-popups-extract\"></a>\n    <footer>\n        <a class=\"mwe-popups-settings-icon\">\n            <span class=\"mw-ui-icon mw-ui-icon-element mw-ui-icon-small mw-ui-icon-settings\"></span>\n        </a>\n    </footer>\n</div>\n\t`;\n\n/**\n * @param {ext.popups.PagePreviewModel} model\n * @param {ext.popups.Thumbnail|null} thumbnail\n * @param {boolean} withCSSClipPath\n * @return {JQuery}\n */\nexport function renderPagePreview(\n\tmodel, thumbnail, withCSSClipPath\n) {\n\tconst $el = renderPopup( model.type, createNodeFromTemplate( templateHTML ) );\n\n\t$el.find( '.mwe-popups-discreet, .mwe-popups-extract' )\n\t\t.attr( 'href', model.url );\n\n\t$el.find( '.mwe-popups-extract' )\n\t\t.attr( 'dir', model.languageDirection )\n\t\t.attr( 'lang', model.languageCode );\n\n\tif ( thumbnail ) {\n\t\t$el.find( '.mwe-popups-discreet' ).append( thumbnail.el );\n\t} else {\n\t\t$el.find( '.mwe-popups-discreet' ).remove();\n\t}\n\n\tconst $extract = $el.find( '.mwe-popups-extract' );\n\tif ( model.extract ) {\n\t\t$extract.append( model.extract );\n\t\tconst extractWidth = getExtractWidth( thumbnail );\n\t\tif ( !withCSSClipPath ) {\n\t\t\t$extract.css( 'width', extractWidth );\n\t\t\t$el.find( 'footer' ).css( 'width', extractWidth );\n\t\t}\n\t}\n\n\treturn $el;\n}\n\nexport { defaultExtractWidth }; // for testing\n\n/**\n * Calculates width of extract based on the associated thumbnail\n *\n * @param {ext.popups.Thumbnail|null} thumbnail model\n * @return {string} representing the css width attribute to be\n *   used for the extract\n */\nexport function getExtractWidth( thumbnail ) {\n\treturn thumbnail && thumbnail.isNarrow ? `${defaultExtractWidth + thumbnail.offset}px` : '';\n}\n","/**\n * @module renderer\n */\n\nimport wait from '../wait';\nimport pointerMaskSVG from './pointer-mask.svg';\nimport { SIZES, createThumbnail } from './thumbnail';\nimport { previewTypes } from '../preview/model';\nimport { renderPreview } from './templates/preview/preview';\nimport { renderReferencePreview } from './templates/referencePreview/referencePreview';\nimport { renderPagePreview } from './templates/pagePreview/pagePreview';\n\nconst landscapePopupWidth = 450,\n\tportraitPopupWidth = 320,\n\tpointerSize = 8, // Height of the pointer.\n\tmaxLinkWidthForCenteredPointer = 28; // Link with roughly < 4 chars.\n\n/**\n * @typedef {Object} ext.popups.Measures\n * @property {number} pageX\n * @property {number} pageY\n * @property {number} clientY\n * @property {ClientRectList} clientRects list of rectangles defined by\n *  four edges\n * @property {Object} offset\n * @property {number} width\n * @property {number} height\n * @property {number} scrollTop\n * @property {number} windowWidth\n * @property {number} windowHeight\n */\n\n/**\n * Extracted from `mw.popups.createSVGMasks`. This is just an SVG mask to point\n * or \"point\" at the link that's hovered over. The \"pointer\" appears to be cut\n * out of the image itself:\n *   _______                  link\n *  |       |    _/\\_____     _/\\____ <-- Pointer pointing at link\n *  |  :-]  | + |xxxxxxx   = |  :-]  |\n *  |_______|   |xxxxxxx     |_______|\n *              :\n *  Thumbnail    Pointer     Page preview\n *    image     clip-path   bubble w/ pointer\n *\n * SVG masks are used in place of CSS masks for browser support issues (see\n * https://caniuse.com/#feat=css-masks).\n *\n * @private\n * @param {Object} container DOM object to which pointer masks are appended\n * @return {void}\n */\nexport function createPointerMasks( container ) {\n\t$( '<div>' )\n\t\t.attr( 'id', 'mwe-popups-svg' )\n\t\t.html( pointerMaskSVG )\n\t\t.appendTo( container );\n}\n\n/**\n * Initializes the renderer.\n *\n * @return {void}\n */\nexport function init() {\n\tif ( !supportsCSSClipPath() ) {\n\t\tcreatePointerMasks( document.body );\n\t}\n}\n\n/**\n * The model of how a view is rendered, which is constructed from a response\n * from the gateway.\n *\n * TODO: Rename `isTall` to `isPortrait`.\n *\n * @typedef {Object} ext.popups.Preview\n * @property {JQuery} el\n * @property {boolean} hasThumbnail\n * @property {Object} thumbnail\n * @property {boolean} isTall Sugar around\n *  `preview.hasThumbnail && thumbnail.isTall`\n */\n\n/**\n * Renders a preview given data from the {@link gateway Gateway}.\n * The preview is rendered and added to the DOM but will remain hidden until\n * the `show` method is called.\n *\n * Previews are rendered at:\n *\n * # The position of the mouse when the user dwells on the link with their\n *   mouse.\n * # The centermost point of the link when the user dwells on the link with\n *   their keyboard or other assistive device.\n *\n * Since the content of the preview doesn't change but its position might, we\n * distinguish between \"rendering\" - generating HTML from a MediaWiki API\n * response - and \"showing/hiding\" - positioning the layout and changing its\n * orientation, if necessary.\n *\n * @param {ext.popups.PreviewModel} model\n * @return {ext.popups.Preview}\n */\nexport function render( model ) {\n\tconst preview = createPreviewWithType( model );\n\n\treturn {\n\t\t/**\n\t\t * Shows the preview given an event representing the user's interaction\n\t\t * with the active link, e.g. an instance of\n\t\t * [MouseEvent](https://developer.mozilla.org/en/docs/Web/API/MouseEvent).\n\t\t *\n\t\t * See `show` for more detail.\n\t\t *\n\t\t * @param {Event} event\n\t\t * @param {Object} boundActions The\n\t\t *  [bound action creators](http://redux.js.org/docs/api/bindActionCreators.html)\n\t\t *  that were (likely) created in [boot.js](./boot.js).\n\t\t * @param {string} token The unique token representing the link interaction\n\t\t *  that resulted in showing the preview\n\t\t * @return {JQuery.Promise<void>}\n\t\t */\n\t\tshow( event, boundActions, token ) {\n\t\t\treturn show(\n\t\t\t\tpreview, event, $( event.target ), boundActions, token,\n\t\t\t\tdocument.body, document.documentElement.getAttribute( 'dir' )\n\t\t\t);\n\t\t},\n\n\t\t/**\n\t\t * Hides the preview.\n\t\t *\n\t\t * See `hide` for more detail.\n\t\t *\n\t\t * @return {JQuery.Promise<void>}\n\t\t */\n\t\thide() {\n\t\t\treturn hide( preview );\n\t\t}\n\t};\n}\n/**\n * Creates an instance of a Preview based on\n * the type property of the PreviewModel\n *\n * @param {ext.popups.PreviewModel} model\n * @return {ext.popups.Preview}\n */\nexport function createPreviewWithType( model ) {\n\tswitch ( model.type ) {\n\t\tcase previewTypes.TYPE_PAGE:\n\t\t\treturn createPagePreview( model );\n\t\tcase previewTypes.TYPE_DISAMBIGUATION:\n\t\t\treturn createDisambiguationPreview( model );\n\t\tcase previewTypes.TYPE_REFERENCE:\n\t\t\treturn createReferencePreview( model );\n\t\tdefault:\n\t\t\treturn createEmptyPreview( model );\n\t}\n}\n\nfunction supportsCSSClipPath() {\n\treturn window.CSS &&\n\t\ttypeof CSS.supports === 'function' &&\n\t\tCSS.supports( 'clip-path', 'polygon(1px 1px)' );\n}\n\n/**\n * Creates an instance of the DTO backing a preview.\n *\n * @param {ext.popups.PagePreviewModel} model\n * @return {ext.popups.Preview}\n */\nfunction createPagePreview( model ) {\n\tconst thumbnail = createThumbnail( model.thumbnail, supportsCSSClipPath() ),\n\t\thasThumbnail = thumbnail !== null,\n\t\twithCSSClipPath = supportsCSSClipPath();\n\n\treturn {\n\t\tel: renderPagePreview( model, thumbnail, withCSSClipPath ),\n\t\thasThumbnail,\n\t\tthumbnail,\n\t\tisTall: hasThumbnail && thumbnail.isTall\n\t};\n}\n\n/**\n * Creates an instance of the DTO backing a preview. In this case the DTO\n * represents a generic preview, which covers the following scenarios:\n *\n * * The page doesn't exist, i.e. the user hovered over a redlink or a\n *   redirect to a page that doesn't exist.\n * * The page doesn't have a viable extract.\n *\n * @param {ext.popups.PagePreviewModel} model\n * @return {ext.popups.Preview}\n */\nfunction createEmptyPreview( model ) {\n\tconst showTitle = false,\n\t\textractMsg = mw.msg( 'popups-preview-no-preview' ),\n\t\tlinkMsg = mw.msg( 'popups-preview-footer-read' );\n\n\treturn {\n\t\tel: renderPreview( model, showTitle, extractMsg, linkMsg ),\n\t\thasThumbnail: false,\n\t\tisTall: false\n\t};\n}\n\n/**\n * Creates an instance of the disambiguation preview.\n *\n * @param {ext.popups.PagePreviewModel} model\n * @return {ext.popups.Preview}\n */\nfunction createDisambiguationPreview( model ) {\n\tconst showTitle = true,\n\t\textractMsg = mw.msg( 'popups-preview-disambiguation' ),\n\t\tlinkMsg = mw.msg( 'popups-preview-disambiguation-link' );\n\n\treturn {\n\t\tel: renderPreview( model, showTitle, extractMsg, linkMsg ),\n\t\thasThumbnail: false,\n\t\tisTall: false\n\t};\n}\n\n/**\n * @param {ext.popups.ReferencePreviewModel} model\n * @return {ext.popups.Preview}\n */\nfunction createReferencePreview( model ) {\n\treturn {\n\t\tel: renderReferencePreview( model ),\n\t\thasThumbnail: false,\n\t\tisTall: false\n\t};\n}\n\n/**\n * Shows the preview.\n *\n * Extracted from `mw.popups.render.openPopup`.\n *\n * TODO: From the perspective of the client, there's no need to distinguish\n * between rendering and showing a preview. Merge #render and Preview#show.\n *\n * @param {ext.popups.Preview} preview\n * @param {ext.popups.Measures} measures\n * @param {JQuery} $link event target\n * @param {ext.popups.PreviewBehavior} behavior\n * @param {string} token\n * @param {Object} container DOM object to which pointer masks are appended\n * @param {string} dir 'ltr' if left-to-right, 'rtl' if right-to-left.\n * @return {JQuery.Promise<void>} A promise that resolves when the promise has\n *                                faded in.\n */\nexport function show(\n\tpreview, measures, $link, behavior, token, container, dir\n) {\n\tconst layout = createLayout(\n\t\tpreview.isTall,\n\t\tmeasures,\n\t\tpointerSize,\n\t\tdir\n\t);\n\n\tpreview.el.appendTo( container );\n\n\tlayoutPreview(\n\t\tpreview, layout, getClasses( preview, layout ),\n\t\tSIZES.landscapeImage.h, pointerSize, measures.windowHeight\n\t);\n\n\tpreview.el.show();\n\n\t// Trigger fading effect for reference previews after the popup has been rendered\n\tif ( preview.el.hasClass( 'mwe-popups-type-reference' ) ) {\n\t\tpreview.el.find( '.mwe-popups-scroll' ).first().trigger( 'scroll' );\n\t}\n\n\treturn wait( 200 )\n\t\t.then( () => {\n\t\t\tbindBehavior( preview, behavior );\n\t\t\tbehavior.previewShow( token );\n\t\t} );\n}\n\n/**\n * Binds the behavior to the interactive elements of the preview.\n *\n * @param {ext.popups.Preview} preview\n * @param {ext.popups.PreviewBehavior} behavior\n * @return {void}\n */\nexport function bindBehavior( preview, behavior ) {\n\tpreview.el.on( 'mouseenter', behavior.previewDwell )\n\t\t.on( 'mouseleave', behavior.previewAbandon );\n\n\tpreview.el.click( behavior.click );\n\n\tpreview.el.find( '.mwe-popups-settings-icon' )\n\t\t.attr( 'href', behavior.settingsUrl )\n\t\t.click( ( event ) => {\n\t\t\tevent.stopPropagation();\n\n\t\t\tbehavior.showSettings( event );\n\t\t} );\n}\n\n/**\n * Extracted from `mw.popups.render.closePopup`.\n *\n * @param {ext.popups.Preview} preview\n * @return {JQuery.Promise<void>} A promise that resolves when the preview has\n *                                faded out.\n */\nexport function hide( preview ) {\n\t// FIXME: This method clearly needs access to the layout of the preview.\n\tconst fadeInClass = ( preview.el.hasClass( 'mwe-popups-fade-in-up' ) ) ?\n\t\t'mwe-popups-fade-in-up' :\n\t\t'mwe-popups-fade-in-down';\n\n\tconst fadeOutClass = ( fadeInClass === 'mwe-popups-fade-in-up' ) ?\n\t\t'mwe-popups-fade-out-down' :\n\t\t'mwe-popups-fade-out-up';\n\n\t// Classes documented above\n\t// eslint-disable-next-line mediawiki/class-doc\n\tpreview.el\n\t\t.removeClass( fadeInClass )\n\t\t.addClass( fadeOutClass );\n\n\treturn wait( 150 ).then( () => {\n\t\tpreview.el.remove();\n\t} );\n}\n\n/**\n * Represents the layout of a preview, which consists of a position (`offset`)\n * and whether or not the preview should be flipped horizontally or\n * vertically (`flippedX` and `flippedY` respectively).\n *\n * @typedef {Object} ext.popups.PreviewLayout\n * @property {Object} offset\n * @property {number} offset.top\n * @property {number} offset.left\n * @property {boolean} flippedX\n * @property {boolean} flippedY\n * @property {string} dir 'ltr' if left-to-right, 'rtl' if right-to-left.\n */\n\n/**\n * @param {boolean} isPreviewTall\n * @param {ext.popups.Measures} measures\n * @param {number} pointerSpaceSize Space reserved for the pointer\n * @param {string} dir 'ltr' if left-to-right, 'rtl' if right-to-left.\n * @return {ext.popups.PreviewLayout}\n */\nexport function createLayout(\n\tisPreviewTall, measures, pointerSpaceSize, dir\n) {\n\tlet flippedX = false,\n\t\tflippedY = false,\n\t\toffsetTop = measures.pageY ?\n\t\t\t// If it was a mouse event, position according to mouse\n\t\t\t// Since client rectangles are relative to the viewport,\n\t\t\t// take scroll position into account.\n\t\t\tgetClosestYPosition(\n\t\t\t\tmeasures.pageY - measures.scrollTop,\n\t\t\t\tmeasures.clientRects,\n\t\t\t\tfalse\n\t\t\t) + measures.scrollTop + pointerSpaceSize :\n\t\t\t// Position according to link position or size\n\t\t\tmeasures.offset.top + measures.height + pointerSize,\n\t\toffsetLeft;\n\tconst clientTop = measures.clientY ? measures.clientY : offsetTop;\n\n\tif ( measures.pageX ) {\n\t\tif ( measures.width > maxLinkWidthForCenteredPointer ) {\n\t\t\t// For wider links, position the popup's pointer at the\n\t\t\t// mouse pointer's location. (x-axis)\n\t\t\toffsetLeft = measures.pageX;\n\t\t} else {\n\t\t\t// For smaller links, position the popup's pointer at\n\t\t\t// the link's center. (x-axis)\n\t\t\toffsetLeft = measures.offset.left + measures.width / 2;\n\t\t}\n\t} else {\n\t\toffsetLeft = measures.offset.left;\n\t}\n\n\t// X Flip\n\tif ( offsetLeft > ( measures.windowWidth / 2 ) ) {\n\t\toffsetLeft += ( !measures.pageX ) ? measures.width : 0;\n\t\toffsetLeft -= !isPreviewTall ?\n\t\t\tportraitPopupWidth :\n\t\t\tlandscapePopupWidth;\n\t\tflippedX = true;\n\t}\n\n\tif ( measures.pageX ) {\n\t\toffsetLeft += ( flippedX ) ? 18 : -18;\n\t}\n\n\t// Y Flip\n\tif ( clientTop > ( measures.windowHeight / 2 ) ) {\n\t\tflippedY = true;\n\n\t\t// Mirror the positioning of the preview when there's no \"Y flip\": rest\n\t\t// the pointer on the edge of the link's bounding rectangle. In this case\n\t\t// the edge is the top-most.\n\t\toffsetTop = measures.offset.top;\n\n\t\t// Change the Y position to the top of the link\n\t\tif ( measures.pageY ) {\n\t\t\t// Since client rectangles are relative to the viewport,\n\t\t\t// take scroll position into account.\n\t\t\toffsetTop = getClosestYPosition(\n\t\t\t\tmeasures.pageY - measures.scrollTop,\n\t\t\t\tmeasures.clientRects,\n\t\t\t\ttrue\n\t\t\t) + measures.scrollTop;\n\t\t}\n\n\t\toffsetTop -= pointerSpaceSize;\n\t}\n\n\treturn {\n\t\toffset: {\n\t\t\ttop: offsetTop,\n\t\t\tleft: offsetLeft\n\t\t},\n\t\tflippedX: dir === 'rtl' ? !flippedX : flippedX,\n\t\tflippedY,\n\t\tdir\n\t};\n}\n\n/**\n * Generates a list of declarative CSS classes that represent the layout of\n * the preview.\n *\n * @param {ext.popups.Preview} preview\n * @param {ext.popups.PreviewLayout} layout\n * @return {string[]}\n */\nexport function getClasses( preview, layout ) {\n\tconst classes = [];\n\n\tif ( layout.flippedY ) {\n\t\tclasses.push( 'mwe-popups-fade-in-down' );\n\t} else {\n\t\tclasses.push( 'mwe-popups-fade-in-up' );\n\t}\n\n\tif ( layout.flippedY && layout.flippedX ) {\n\t\tclasses.push( 'flipped-x-y' );\n\t} else if ( layout.flippedY ) {\n\t\tclasses.push( 'flipped-y' );\n\t} else if ( layout.flippedX ) {\n\t\tclasses.push( 'flipped-x' );\n\t}\n\n\tif ( ( !preview.hasThumbnail || preview.isTall && !layout.flippedX ) &&\n\t\t!layout.flippedY ) {\n\t\tclasses.push( 'mwe-popups-no-image-pointer' );\n\t}\n\n\tif ( preview.hasThumbnail && !preview.isTall && !layout.flippedY ) {\n\t\tclasses.push( 'mwe-popups-image-pointer' );\n\t}\n\n\tif ( preview.isTall ) {\n\t\tclasses.push( 'mwe-popups-is-tall' );\n\t} else {\n\t\tclasses.push( 'mwe-popups-is-not-tall' );\n\t}\n\n\treturn classes;\n}\n\n/**\n * Lays out the preview given the layout.\n *\n * If the thumbnail is landscape and isn't the full height of the thumbnail\n * container, then pull the extract up to keep whitespace consistent across\n * previews.\n *\n * @param {ext.popups.Preview} preview\n * @param {ext.popups.PreviewLayout} layout\n * @param {string[]} classes class names used for layout out the preview\n * @param {number} predefinedLandscapeImageHeight landscape image height\n * @param {number} pointerSpaceSize\n * @param {number} windowHeight\n * @return {void}\n */\nexport function layoutPreview(\n\tpreview, layout, classes, predefinedLandscapeImageHeight, pointerSpaceSize, windowHeight\n) {\n\tconst popup = preview.el,\n\t\tisTall = preview.isTall,\n\t\thasThumbnail = preview.hasThumbnail,\n\t\tthumbnail = preview.thumbnail,\n\t\tflippedY = layout.flippedY;\n\n\tif (\n\t\t!flippedY && !isTall && hasThumbnail &&\n\t\t\tthumbnail.height < predefinedLandscapeImageHeight && !supportsCSSClipPath()\n\t) {\n\t\tpopup.find( '.mwe-popups-extract' ).css(\n\t\t\t'margin-top',\n\t\t\tthumbnail.height - pointerSpaceSize\n\t\t);\n\t}\n\n\t// eslint-disable-next-line mediawiki/class-doc\n\tpopup.addClass( classes.join( ' ' ) );\n\n\tpopup.css( {\n\t\tleft: `${layout.offset.left}px`,\n\t\ttop: flippedY ? 'auto' : layout.offset.top,\n\t\tbottom: flippedY ? `${windowHeight - layout.offset.top}px` : 'auto'\n\t} );\n\n\tif ( hasThumbnail && !supportsCSSClipPath() ) {\n\t\tsetThumbnailClipPath( preview, layout );\n\t}\n}\n\n/**\n * Sets the thumbnail SVG clip-path.\n *\n * If the preview should be oriented differently, then the pointer is updated,\n * e.g. if the preview should be flipped vertically, then the pointer is\n * removed.\n *\n * Note: SVG clip-paths are supported everywhere but clip-paths as CSS\n * properties are not (https://caniuse.com/#feat=css-clip-path). For this\n * reason, RTL flipping is handled in JavaScript instead of CSS.\n *\n * @param {ext.popups.Preview} preview\n * @param {ext.popups.PreviewLayout} layout\n * @return {void}\n */\nexport function setThumbnailClipPath(\n\t{ el, isTall, thumbnail }, { flippedY, flippedX, dir }\n) {\n\tconst maskID = getThumbnailClipPathID( isTall, flippedY, flippedX );\n\tif ( maskID ) {\n\t\t// CSS matrix transform entries:\n\t\t// ⎡ sx c tx ⎤\n\t\t// ⎣ sy d ty ⎦\n\t\tconst matrix = {\n\t\t\tscaleX: 1,\n\t\t\t// moving the mask horizontally if the image is less than the maximum width\n\t\t\ttranslateX: isTall ? Math.min( thumbnail.width - SIZES.portraitImage.w, 0 ) : 0\n\t\t};\n\n\t\tif ( dir === 'rtl' ) {\n\t\t\t// flipping the mask horizontally\n\t\t\tmatrix.scaleX = -1;\n\t\t\t// moving the mask horizontally to the max width of the thumbnail\n\t\t\tmatrix.translateX = isTall ? SIZES.portraitImage.w : SIZES.landscapeImage.w;\n\t\t}\n\n\t\t// Transform the clip-path not the image it is applied to.\n\t\tconst mask = document.getElementById( maskID );\n\t\tmask.setAttribute(\n\t\t\t'transform',\n\t\t\t`matrix(${matrix.scaleX} 0 0 1 ${matrix.translateX} 0)`\n\t\t);\n\n\t\tel.find( 'image' )[ 0 ]\n\t\t\t.setAttribute( 'clip-path', `url(#${maskID})` );\n\t}\n}\n\n/**\n * Gets the thumbnail SVG clip-path element ID as specified in pointer-mask.svg.\n *\n * @param {boolean} isTall Sugar around\n *  `preview.hasThumbnail && thumbnail.isTall`\n * @param {boolean} flippedY\n * @param {boolean} flippedX\n * @return {string|undefined}\n */\nexport function getThumbnailClipPathID( isTall, flippedY, flippedX ) {\n\t// Clip-paths are only needed when the pointer is in a corner that is covered by the thumbnail.\n\t// This is only the case in 4 of 8 situations:\n\tif ( !isTall && !flippedY ) {\n\t\t// 1. Landscape thumbnails cover the upper half of the popup. This is only the case when the\n\t\t// pointer is not flipped to the bottom.\n\t\treturn flippedX ? 'mwe-popups-mask-flip' : 'mwe-popups-mask';\n\t} else if ( isTall && flippedX ) {\n\t\t// 2. Tall thumbnails cover the right half of the popup. This is only the case when the\n\t\t// pointer is flipped to the right.\n\t\treturn flippedY ? 'mwe-popups-landscape-mask-flip' : 'mwe-popups-landscape-mask';\n\t}\n\n\t// The 4 combinations not covered above don't need a clip-path.\n\treturn undefined;\n}\n\n/**\n * Given the rectangular box(es) find the 'y' boundary of the closest\n * rectangle to the point 'y'. The point 'y' is the location of the mouse\n * on the 'y' axis and the rectangular box(es) are the borders of the\n * element over which the mouse is located. There will be more than one\n * rectangle in case the element spans multiple lines.\n *\n * In the majority of cases the mouse pointer will be inside a rectangle.\n * However, some browsers (i.e. Chrome) trigger a hover action even when\n * the mouse pointer is just outside a bounding rectangle. That's why\n * we need to look at all rectangles and not just the rectangle that\n * encloses the point.\n *\n * @private\n * @param {number} y the point for which the closest location is being\n *  looked for\n * @param {ClientRectList} rects list of rectangles defined by four edges\n * @param {boolean} [isTop] should the resulting rectangle's top 'y'\n *  boundary be returned. By default the bottom 'y' value is returned.\n * @return {number}\n */\nexport function getClosestYPosition( y, rects, isTop ) {\n\tlet minY = null, result;\n\n\tArray.prototype.slice.call( rects ).forEach( ( rect ) => {\n\t\tconst deltaY = Math.abs( y - rect.top + y - rect.bottom );\n\n\t\tif ( minY === null || minY > deltaY ) {\n\t\t\tminY = deltaY;\n\t\t\t// Make sure the resulting point is at or outside the rectangle\n\t\t\t// boundaries.\n\t\t\tresult = ( isTop ) ? Math.floor( rect.top ) : Math.ceil( rect.bottom );\n\t\t}\n\t} );\n\n\treturn result;\n}\n","/**\n * @module changeListeners/syncUserSettings\n */\n\n/**\n * Creates an instance of the user settings sync change listener.\n *\n * This change listener syncs certain parts of the state tree to user\n * settings when they change.\n *\n * Used for:\n *\n * * Enabled state: If the previews are enabled or disabled.\n * * Preview count: When the user dwells on a link for long enough that\n *   a preview is shown, then their preview count will be incremented (see\n *   `reducers/eventLogging.js`, and is persisted to local storage.\n *\n * @param {ext.popups.UserSettings} userSettings\n * @return {ext.popups.ChangeListener}\n */\nexport default function syncUserSettings( userSettings ) {\n\treturn ( prevState, state ) => {\n\t\tsyncIfChanged(\n\t\t\tprevState, state, 'eventLogging', 'previewCount',\n\t\t\tuserSettings.setPreviewCount\n\t\t);\n\t\tsyncIfChanged(\n\t\t\tprevState, state, 'preview', 'enabled',\n\t\t\tuserSettings.setIsEnabled\n\t\t);\n\n\t};\n}\n\n/**\n * Given a state tree, reducer and property, safely return the value of the\n * property if the reducer and property exist\n *\n * @param {Object} state tree\n * @param {string} reducer key to access on the state tree\n * @param {string} prop key to access on the reducer key of the state tree\n * @return {*}\n */\nfunction get( state, reducer, prop ) {\n\treturn state[ reducer ] && state[ reducer ][ prop ];\n}\n\n/**\n * Calls a sync function if the property prop on the property reducer on\n * the state trees has changed value.\n *\n * @param {Object} prevState\n * @param {Object} state\n * @param {string} reducer key to access on the state tree\n * @param {string} prop key to access on the reducer key of the state tree\n * @param {Function} sync function to be called with the newest value if\n * changed\n * @return {void}\n */\nfunction syncIfChanged( prevState, state, reducer, prop, sync ) {\n\tconst current = get( state, reducer, prop );\n\tif ( prevState && ( get( prevState, reducer, prop ) !== current ) ) {\n\t\tsync( current );\n\t}\n}\n","import footerLink from './footerLink';\nimport eventLogging from './eventLogging';\nimport linkTitle from './linkTitle';\nimport pageviews from './pageviews';\nimport render from './render';\nimport settings from './settings';\nimport statsv from './statsv';\nimport syncUserSettings from './syncUserSettings';\n\nexport default {\n\tfooterLink,\n\teventLogging,\n\tlinkTitle,\n\tpageviews,\n\trender,\n\tsettings,\n\tstatsv,\n\tsyncUserSettings\n};\n","/**\n * @module changeListeners/footerLink\n */\n\n/**\n * Creates the link element and appends it to the footer element.\n *\n * The following elements are considered to be the footer element (highest\n * priority to lowest):\n *\n * # `#footer-places`\n * # `#f-list`\n * # The parent element of `#footer li`, which is either an `ol` or `ul`.\n *\n * @return {JQuery} The link element\n */\nfunction createFooterLink() {\n\tconst $link = $( '<li>' ).append(\n\t\t$( '<a>' )\n\t\t\t.attr( 'href', '#' )\n\t\t\t.text( mw.message( 'popups-settings-enable' ).text() )\n\t);\n\n\t// As yet, we don't know whether the link should be visible.\n\t$link.hide();\n\n\t// From https://en.wikipedia.org/wiki/MediaWiki:Gadget-ReferenceTooltips.js,\n\t// which was written by Yair rand <https://en.wikipedia.org/wiki/User:Yair_rand>.\n\t// eslint-disable-next-line no-jquery/no-global-selector\n\tlet $footer = $( '#footer-places, #f-list' );\n\n\tif ( $footer.length === 0 ) {\n\t\t// eslint-disable-next-line no-jquery/no-global-selector\n\t\t$footer = $( '#footer li' ).parent();\n\t}\n\n\t$footer.append( $link );\n\n\treturn $link;\n}\n\n/**\n * Creates an instance of the footer link change listener.\n *\n * The change listener covers the following behaviour:\n *\n * * The \"Enable previews\" link (the \"link\") is appended to the footer menu\n *   (see `createFooterLink` above).\n * * When Page Previews are disabled, then the link is shown; otherwise, the\n *   link is hidden.\n * * When the user clicks the link, then the `showSettings` bound action\n *   creator is called.\n *\n * @param {Object} boundActions\n * @return {ext.popups.ChangeListener}\n */\nexport default function footerLink( boundActions ) {\n\tlet $footerLink;\n\n\treturn ( prevState, state ) => {\n\t\tif ( $footerLink === undefined ) {\n\t\t\t$footerLink = createFooterLink();\n\t\t\t$footerLink.on( 'click', ( e ) => {\n\t\t\t\te.preventDefault();\n\t\t\t\tboundActions.showSettings();\n\t\t\t} );\n\t\t}\n\n\t\tif ( state.settings.shouldShowFooterLink ) {\n\t\t\t$footerLink.show();\n\t\t} else {\n\t\t\t$footerLink.hide();\n\t\t}\n\t};\n}\n","/**\n * @module changeListeners/eventLogging\n */\n\n/**\n * Creates an instance of the event logging change listener.\n *\n * When an event is enqueued it'll be logged using the schema. Since it's the\n * responsibility of Event Logging (and the UA) to deliver logged events,\n * `EVENT_LOGGED` is immediately dispatched rather than waiting for some\n * indicator of completion.\n *\n * @param {Object} boundActions\n * @param {EventTracker} eventLoggingTracker\n * @param {Function} getCurrentTimestamp\n * @return {ext.popups.ChangeListener}\n */\nexport default function eventLogging(\n\tboundActions, eventLoggingTracker, getCurrentTimestamp\n) {\n\treturn ( _, state ) => {\n\t\tconst eventLoggingObj = state.eventLogging;\n\t\tlet event = eventLoggingObj.event;\n\n\t\tif ( !event ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Per https://meta.wikimedia.org/wiki/Schema:Popups, the timestamp\n\t\t// property should be the time at which the event is logged and not the\n\t\t// time at which the interaction started.\n\t\t//\n\t\t// Rightly or wrongly, it's left as an exercise for the analyst to\n\t\t// calculate the time at which the interaction started as part of their\n\t\t// analyses, e.g. https://phabricator.wikimedia.org/T186016#4002923.\n\t\tevent = $.extend( true, {}, eventLoggingObj.baseData, event, {\n\t\t\ttimestamp: getCurrentTimestamp()\n\t\t} );\n\n\t\teventLoggingTracker( 'event.Popups', event );\n\t\t// Dispatch the eventLogged action so that the state tree can be\n\t\t// cleared/updated.\n\t\tboundActions.eventLogged( event );\n\t};\n}\n","/**\n * Creates an instance of the link title change listener.\n *\n * While the user dwells on a link, then it becomes the active link. The\n * change listener will remove a link's `title` attribute while it's the\n * active link.\n *\n * @return {ext.popups.ChangeListener}\n */\nexport default function linkTitle() {\n\tlet title;\n\n\t/**\n\t * Destroys the title attribute of the element, storing its value in local\n\t * state so that it can be restored later (see `restoreTitleAttr`).\n\t *\n\t * @param {Element} el\n\t * @return {void}\n\t */\n\tfunction destroyTitleAttr( el ) {\n\t\tconst $el = $( el );\n\n\t\t// Has the user dwelled on a link? If we've already removed its title\n\t\t// attribute, then NOOP.\n\t\tif ( title ) {\n\t\t\treturn;\n\t\t}\n\n\t\ttitle = $el.attr( 'title' );\n\n\t\t$el.attr( 'title', '' );\n\t}\n\n\t/**\n\t * Restores the title attribute of the element.\n\t *\n\t * @param {Element} el\n\t * @return {void}\n\t */\n\tfunction restoreTitleAttr( el ) {\n\t\t$( el ).attr( 'title', title );\n\n\t\ttitle = undefined;\n\t}\n\n\treturn ( prevState, state ) => {\n\t\tconst hasPrevActiveLink = prevState && prevState.preview.activeLink;\n\n\t\tif ( !state.preview.enabled ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( hasPrevActiveLink ) {\n\t\t\t// Has the user dwelled on a link immediately after abandoning another\n\t\t\t// (remembering that the ABANDON_END action is delayed by\n\t\t\t// ~100 ms).\n\t\t\tif ( prevState.preview.activeLink !== state.preview.activeLink ) {\n\t\t\t\trestoreTitleAttr( prevState.preview.activeLink );\n\t\t\t}\n\t\t}\n\n\t\tif ( state.preview.activeLink ) {\n\t\t\tdestroyTitleAttr( state.preview.activeLink );\n\t\t}\n\t};\n}\n","/**\n * @module changeListeners/pageviews\n */\n\n/**\n * Creates an instance of the pageviews change listener.\n *\n * When a pageview enqueued it'll be logged using the VirtualPageView schema.\n * Note, it's the responsibility of Event Logging (and the UA) to\n * deliver logged events.\n *\n * @param {Object} boundActions\n * @param {EventTracker} pageviewTracker\n * @return {ext.popups.ChangeListener}\n */\nexport default function pageviews(\n\tboundActions, pageviewTracker\n) {\n\treturn ( _, state ) => {\n\t\tlet page;\n\t\tif ( state.pageviews && state.pageviews.pageview && state.pageviews.page ) {\n\t\t\tpage = state.pageviews.page;\n\t\t\tpageviewTracker( 'event.VirtualPageView', $.extend( {},\n\t\t\t\t{\n\t\t\t\t\t/* eslint-disable camelcase */\n\t\t\t\t\tsource_page_id: page.id,\n\t\t\t\t\tsource_namespace: page.namespaceId,\n\t\t\t\t\tsource_title: page.title,\n\t\t\t\t\tsource_url: page.url\n\t\t\t\t\t/* eslint-enable camelcase */\n\t\t\t\t},\n\t\t\t\tstate.pageviews.pageview )\n\t\t\t);\n\t\t\t// Clear the pageview now its been logged.\n\t\t\tboundActions.pageviewLogged();\n\t\t}\n\t};\n}\n","import * as renderer from '../ui/renderer';\n\n/**\n * Creates an instance of the render change listener.\n *\n * FIXME: Remove hard coupling with renderer, inject it as a parameter\n * * Wire it up in index.js\n * * Fix tests to remove require mocking\n *\n * @param {ext.popups.PreviewBehavior} previewBehavior\n * @return {ext.popups.ChangeListener}\n */\nexport default function render( previewBehavior ) {\n\tlet preview;\n\n\treturn ( prevState, state ) => {\n\t\tif ( state.preview.shouldShow && !preview ) {\n\t\t\tpreview = renderer.render( state.preview.fetchResponse );\n\t\t\tpreview.show(\n\t\t\t\tstate.preview.measures,\n\t\t\t\tpreviewBehavior,\n\t\t\t\tstate.preview.activeToken\n\t\t\t);\n\t\t} else if ( !state.preview.shouldShow && preview ) {\n\t\t\tpreview.hide();\n\t\t\tpreview = undefined;\n\t\t}\n\t};\n}\n","/**\n * Creates an instance of the settings change listener.\n *\n * @param {Object} boundActions\n * @param {Object} render function that renders a jQuery el with the settings\n * @return {ext.popups.ChangeListener}\n */\nexport default function settings( boundActions, render ) {\n\tlet settingsObj;\n\n\treturn ( prevState, state ) => {\n\t\tif ( !prevState ) {\n\t\t\t// Nothing to do on initialization\n\t\t\treturn;\n\t\t}\n\n\t\t// Update global modal visibility\n\t\tif (\n\t\t\tprevState.settings.shouldShow === false &&\n\t\t\tstate.settings.shouldShow === true\n\t\t) {\n\t\t\t// Lazily instantiate the settings UI\n\t\t\tif ( !settingsObj ) {\n\t\t\t\tsettingsObj = render( boundActions );\n\t\t\t\tsettingsObj.appendTo( document.body );\n\t\t\t}\n\n\t\t\t// Update the UI settings with the current settings\n\t\t\tsettingsObj.setEnabled( state.preview.enabled );\n\n\t\t\tsettingsObj.show();\n\t\t} else if (\n\t\t\tprevState.settings.shouldShow === true &&\n\t\t\tstate.settings.shouldShow === false\n\t\t) {\n\t\t\tsettingsObj.hide();\n\t\t}\n\n\t\t// Update help visibility\n\t\tif ( prevState.settings.showHelp !== state.settings.showHelp ) {\n\t\t\tsettingsObj.toggleHelp( state.settings.showHelp );\n\t\t}\n\t};\n}\n","/**\n * Creates an instance of the statsv change listener.\n *\n * The listener will log events to StatsD via the [the \"StatsD timers and\n * counters\" analytics event protocol][0].\n *\n * [0]: https://github.com/wikimedia/mediawiki-extensions-WikimediaEvents/blob/29c864a0/modules/ext.wikimediaEvents.statsd.js\n *\n * @param {Object} boundActions\n * @param {EventTracker} track\n * @return {ext.popups.ChangeListener}\n */\nexport default function statsv( boundActions, track ) {\n\treturn ( _, state ) => {\n\t\tconst statsvObj = state.statsv;\n\n\t\tif ( statsvObj.action ) {\n\t\t\ttrack( statsvObj.action, statsvObj.data );\n\n\t\t\tboundActions.statsvLogged();\n\t\t}\n\t};\n}\n","/**\n * @module actionTypes\n */\n\nexport default {\n\tBOOT: 'BOOT',\n\tLINK_DWELL: 'LINK_DWELL',\n\tABANDON_START: 'ABANDON_START',\n\tABANDON_END: 'ABANDON_END',\n\tLINK_CLICK: 'LINK_CLICK',\n\t/** Precedes a fetch. */\n\tFETCH_START: 'FETCH_START',\n\t/** Follows a successful fetch. */\n\tFETCH_END: 'FETCH_END',\n\t/** Follows a fetch regardless of whether it was successful. */\n\tFETCH_COMPLETE: 'FETCH_COMPLETE',\n\t/** Follows an unsuccessful fetch. */\n\tFETCH_FAILED: 'FETCH_FAILED',\n\t/** Follows an aborted fetch */\n\tFETCH_ABORTED: 'FETCH_ABORTED',\n\tPAGEVIEW_LOGGED: 'PAGEVIEW_LOGGED',\n\tPREVIEW_DWELL: 'PREVIEW_DWELL',\n\tPREVIEW_SHOW: 'PREVIEW_SHOW',\n\tPREVIEW_CLICK: 'PREVIEW_CLICK',\n\t/**\n\t\tOccurs when a preview has been opened for a significant amount of time and\n\t\tis assumed to have been viewed.\n\t */\n\tPREVIEW_SEEN: 'PREVIEW_SEEN',\n\tSETTINGS_SHOW: 'SETTINGS_SHOW',\n\tSETTINGS_HIDE: 'SETTINGS_HIDE',\n\tSETTINGS_CHANGE: 'SETTINGS_CHANGE',\n\tEVENT_LOGGED: 'EVENT_LOGGED',\n\tSTATSV_LOGGED: 'STATSV_LOGGED'\n};\n","/**\n * @module actions\n */\n\nimport types from './actionTypes';\nimport wait from './wait';\nimport { createNullModel, previewTypes } from './preview/model';\n\nconst\n\t// See the following for context around this value.\n\t//\n\t// * https://phabricator.wikimedia.org/T161284\n\t// * https://phabricator.wikimedia.org/T70861#3129780\n\tFETCH_START_DELAY = 150, // ms.\n\n\t// The minimum time a preview must be open before we judge it\n\t// has been seen.\n\t// See https://phabricator.wikimedia.org/T184793\n\tPREVIEW_SEEN_DURATION = 1000, // ms\n\n\t// The delay after which a FETCH_COMPLETE action should be dispatched.\n\t//\n\t// If the API endpoint responds faster than 350 ms (or, say, the API\n\t// response is served from the UA's cache), then we introduce a delay of\n\t// 350 ms - t to make the preview delay consistent to the user. The total\n\t// delay from start to finish is 500 ms.\n\tFETCH_COMPLETE_TARGET_DELAY = 350 + FETCH_START_DELAY, // ms.\n\n\tFETCH_DELAY_REFERENCE_TYPE = 150, // ms.\n\n\tABANDON_END_DELAY = 300; // ms.\n\n/**\n * Mixes in timing information to an action.\n *\n * Warning: the `baseAction` parameter is modified and returned.\n *\n * @param {Object} baseAction\n * @return {Object}\n */\nfunction timedAction( baseAction ) {\n\tbaseAction.timestamp = mw.now();\n\n\treturn baseAction;\n}\n\n/**\n * Represents Page Previews booting.\n *\n * When a Redux store is created, the `@@INIT` action is immediately\n * dispatched to it. To avoid overriding the term, we refer to booting rather\n * than initializing.\n *\n * Page Previews persists critical pieces of information to local storage.\n * Since reading from and writing to local storage are synchronous, Page\n * Previews is booted when the browser is idle (using\n * [`mw.requestIdleCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Window/requestIdleCallback))\n * so as not to impact latency-critical events.\n *\n * @param {boolean} isEnabled See `isEnabled.js`\n * @param {mw.user} user\n * @param {ext.popups.UserSettings} userSettings\n * @param {mw.Map} config The config of the MediaWiki client-side application,\n *  i.e. `mw.config`\n * @param {string} url url\n * @return {Object}\n */\nexport function boot(\n\tisEnabled,\n\tuser,\n\tuserSettings,\n\tconfig,\n\turl\n) {\n\tconst editCount = config.get( 'wgUserEditCount' ),\n\t\tpreviewCount = userSettings.getPreviewCount();\n\n\treturn {\n\t\ttype: types.BOOT,\n\t\tisEnabled,\n\t\tisNavPopupsEnabled: config.get( 'wgPopupsConflictsWithNavPopupGadget' ),\n\t\tsessionToken: user.sessionId(),\n\t\tpageToken: user.getPageviewToken(),\n\t\tpage: {\n\t\t\turl,\n\t\t\ttitle: config.get( 'wgTitle' ),\n\t\t\tnamespaceId: config.get( 'wgNamespaceNumber' ),\n\t\t\tid: config.get( 'wgArticleId' )\n\t\t},\n\t\tuser: {\n\t\t\tisAnon: user.isAnon(),\n\t\t\teditCount,\n\t\t\tpreviewCount\n\t\t}\n\t};\n}\n\n/**\n * Determines the delay before showing the preview when dwelling a link.\n *\n * @param {string} type\n * @return {number}\n */\nfunction getDwellDelay( type ) {\n\tswitch ( type ) {\n\t\tcase previewTypes.TYPE_PAGE:\n\t\t\treturn FETCH_COMPLETE_TARGET_DELAY - FETCH_START_DELAY;\n\t\tcase previewTypes.TYPE_REFERENCE:\n\t\t\treturn FETCH_DELAY_REFERENCE_TYPE;\n\t\tdefault:\n\t\t\treturn 0;\n\t}\n}\n\n/**\n * Represents Page Previews fetching data via the gateway.\n *\n * @param {Gateway} gateway\n * @param {mw.Title} title\n * @param {Element} el\n * @param {string} token The unique token representing the link interaction that\n *  triggered the fetch\n * @param {string} type\n * @return {Redux.Thunk}\n */\nexport function fetch( gateway, title, el, token, type ) {\n\tconst titleText = title.getPrefixedDb(),\n\t\tnamespaceId = title.namespace;\n\n\treturn ( dispatch ) => {\n\t\tconst xhr = gateway.fetchPreviewForTitle( title, el );\n\n\t\tdispatch( timedAction( {\n\t\t\ttype: types.FETCH_START,\n\t\t\tel,\n\t\t\ttitle: titleText,\n\t\t\tnamespaceId,\n\t\t\tpromise: xhr\n\t\t} ) );\n\n\t\tconst chain = xhr\n\t\t\t.then( ( result ) => {\n\t\t\t\tdispatch( timedAction( {\n\t\t\t\t\ttype: types.FETCH_END,\n\t\t\t\t\tel\n\t\t\t\t} ) );\n\n\t\t\t\treturn result;\n\t\t\t} )\n\t\t\t.catch( ( err, data ) => {\n\t\t\t\tconst exception = new Error( err );\n\t\t\t\tconst fetchType = data && data.textStatus && data.textStatus === 'abort' ?\n\t\t\t\t\ttypes.FETCH_ABORTED : types.FETCH_FAILED;\n\n\t\t\t\texception.data = data;\n\t\t\t\tdispatch( {\n\t\t\t\t\ttype: fetchType,\n\t\t\t\t\tel,\n\t\t\t\t\ttoken\n\t\t\t\t} );\n\t\t\t\t// Keep the request promise in a rejected status since it failed.\n\t\t\t\tthrow exception;\n\t\t\t} );\n\n\t\treturn $.when(\n\t\t\tchain,\n\t\t\twait( getDwellDelay( type ) )\n\t\t)\n\t\t\t.then( ( result ) => {\n\t\t\t\tdispatch( {\n\t\t\t\t\ttype: types.FETCH_COMPLETE,\n\t\t\t\t\tel,\n\t\t\t\t\tresult,\n\t\t\t\t\ttoken\n\t\t\t\t} );\n\t\t\t} )\n\t\t\t.catch( ( ex ) => {\n\t\t\t\tconst result = ex.data;\n\t\t\t\tlet showNullPreview = true;\n\t\t\t\t// All failures, except those due to being offline or network error,\n\t\t\t\t// should present \"There was an issue displaying this preview\".\n\t\t\t\t// e.g.:\n\t\t\t\t// - Show (timeout): data=\"http\" {xhr: {…}, textStatus: \"timeout\",\n\t\t\t\t//   exception: \"timeout\"}\n\t\t\t\t// - Show (bad MW request): data=\"unknown_action\" {error: {…}}\n\t\t\t\t// - Show (RB 4xx): data=\"http\" {xhr: {…}, textStatus: \"error\",\n\t\t\t\t//   exception: \"Bad Request\"}\n\t\t\t\t// - Show (RB 5xx): data=\"http\" {xhr: {…}, textStatus: \"error\",\n\t\t\t\t//   exception: \"Service Unavailable\"}\n\t\t\t\t// - Suppress (offline or network error): data=\"http\"\n\t\t\t\t//   result={xhr: {…}, textStatus: \"error\", exception: \"\"}\n\t\t\t\t// - Abort: data=\"http\"\n\t\t\t\t//   result={xhr: {…}, textStatus: \"abort\", exception: \"abort\"}\n\n\t\t\t\tif ( result && result.xhr && result.xhr.readyState === 0 ) {\n\t\t\t\t\tconst isNetworkError = result.textStatus === 'error' && result.exception === '';\n\t\t\t\t\tshowNullPreview = !( isNetworkError || result.textStatus === 'abort' );\n\t\t\t\t}\n\n\t\t\t\tif ( showNullPreview ) {\n\t\t\t\t\tdispatch( {\n\t\t\t\t\t\ttype: types.FETCH_COMPLETE,\n\t\t\t\t\t\tel,\n\t\t\t\t\t\tresult: createNullModel( titleText, title.getUrl() ),\n\t\t\t\t\t\ttoken\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t} );\n\t};\n}\n\n/**\n * Represents the user dwelling on a link, either by hovering over it with\n * their mouse or by focussing it using their keyboard or an assistive device.\n *\n * @param {mw.Title} title\n * @param {Element} el\n * @param {ext.popups.Measures} measures\n * @param {Gateway} gateway\n * @param {Function} generateToken\n * @param {string} type\n * @return {Redux.Thunk}\n */\nexport function linkDwell( title, el, measures, gateway, generateToken, type ) {\n\tconst token = generateToken(),\n\t\ttitleText = title.getPrefixedDb(),\n\t\tnamespaceId = title.namespace;\n\n\treturn ( dispatch, getState ) => {\n\t\tconst promise = wait( FETCH_START_DELAY );\n\t\tconst action = timedAction( {\n\t\t\ttype: types.LINK_DWELL,\n\t\t\tel,\n\t\t\tmeasures,\n\t\t\ttoken,\n\t\t\ttitle: titleText,\n\t\t\tnamespaceId,\n\t\t\tpromise\n\t\t} );\n\n\t\tdispatch( action );\n\n\t\t// Has the new generated token been accepted?\n\t\tfunction isNewInteraction() {\n\t\t\treturn getState().preview.activeToken === token;\n\t\t}\n\n\t\tif ( !isNewInteraction() ) {\n\t\t\treturn $.Deferred().resolve().promise();\n\t\t}\n\n\t\treturn promise.then( () => {\n\t\t\tconst previewState = getState().preview;\n\n\t\t\tif ( previewState.enabled && isNewInteraction() ) {\n\t\t\t\treturn dispatch( fetch( gateway, title, el, token, type ) );\n\t\t\t}\n\t\t} );\n\t};\n}\n\n/**\n * Represents the user abandoning a link, either by moving their mouse away\n * from it or by shifting focus to another UI element using their keyboard or\n * an assistive device, or abandoning a preview by moving their mouse away\n * from it.\n *\n * @return {Redux.Thunk}\n */\nexport function abandon() {\n\treturn ( dispatch, getState ) => {\n\t\tconst { activeToken: token, promise } = getState().preview;\n\n\t\tif ( !token ) {\n\t\t\treturn $.Deferred().resolve().promise();\n\t\t}\n\n\t\tdispatch( timedAction( {\n\t\t\ttype: types.ABANDON_START,\n\t\t\ttoken\n\t\t} ) );\n\n\t\tif ( 'abort' in promise ) {\n\t\t\t// Immediately request that any outstanding fetch request be abandoned. Do not wait.\n\t\t\tpromise.abort();\n\t\t}\n\n\t\treturn wait( ABANDON_END_DELAY )\n\t\t\t.then( () => {\n\t\t\t\tdispatch( {\n\t\t\t\t\ttype: types.ABANDON_END,\n\t\t\t\t\ttoken\n\t\t\t\t} );\n\t\t\t} );\n\t};\n}\n\n/**\n * Represents the user clicking on a link with their mouse, keyboard, or an\n * assistive device.\n *\n * @param {Element} el\n * @return {Object}\n */\nexport function linkClick( el ) {\n\treturn timedAction( {\n\t\ttype: types.LINK_CLICK,\n\t\tel\n\t} );\n}\n\n/**\n * Represents the user dwelling on a preview with their mouse.\n *\n * @return {Object}\n */\nexport function previewDwell() {\n\treturn {\n\t\ttype: types.PREVIEW_DWELL\n\t};\n}\n\n/**\n * Represents a preview being shown to the user.\n *\n * This action is dispatched by the `./changeListeners/render.js` change\n * listener.\n *\n * @param {string} token\n * @return {Object}\n */\nexport function previewShow( token ) {\n\treturn ( dispatch, getState ) => {\n\t\tdispatch(\n\t\t\ttimedAction( {\n\t\t\t\ttype: types.PREVIEW_SHOW,\n\t\t\t\ttoken\n\t\t\t} )\n\t\t);\n\n\t\treturn wait( PREVIEW_SEEN_DURATION )\n\t\t\t.then( () => {\n\t\t\t\tconst state = getState(),\n\t\t\t\t\tpreview = state.preview,\n\t\t\t\t\tfetchResponse = preview && preview.fetchResponse,\n\t\t\t\t\tcurrentToken = preview && preview.activeToken,\n\t\t\t\t\tvalidType = fetchResponse && [\n\t\t\t\t\t\tpreviewTypes.TYPE_PAGE,\n\t\t\t\t\t\tpreviewTypes.TYPE_DISAMBIGUATION\n\t\t\t\t\t].indexOf( fetchResponse.type ) > -1;\n\n\t\t\t\tif (\n\t\t\t\t\t// Check the pageview can still be associated with original event\n\t\t\t\t\tcurrentToken && currentToken === token &&\n\t\t\t\t\t// and the preview is still active and of type `page`\n\t\t\t\t\tfetchResponse && validType\n\t\t\t\t) {\n\t\t\t\t\tdispatch( {\n\t\t\t\t\t\ttype: types.PREVIEW_SEEN,\n\t\t\t\t\t\ttitle: fetchResponse.title,\n\t\t\t\t\t\tpageId: fetchResponse.pageId,\n\t\t\t\t\t\t// The existing version of summary endpoint does not\n\t\t\t\t\t\t// provide namespace information, but new version\n\t\t\t\t\t\t// will. Given we only show pageviews for main namespace\n\t\t\t\t\t\t// this is hardcoded until the newer version is available.\n\t\t\t\t\t\tnamespace: 0\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t} );\n\t};\n}\n\n/**\n * Represents the situation when a pageview has been logged\n * (see previewShow and PREVIEW_SEEN action type)\n *\n * @return {Object}\n */\nexport function pageviewLogged() {\n\treturn {\n\t\ttype: types.PAGEVIEW_LOGGED\n\t};\n}\n\n/**\n * Represents the user clicking either the \"Enable previews\" footer menu link,\n * or the \"cog\" icon that's present on each preview.\n *\n * @return {Object}\n */\nexport function showSettings() {\n\treturn {\n\t\ttype: types.SETTINGS_SHOW\n\t};\n}\n\n/**\n * Represents the user closing the settings dialog and saving their settings.\n *\n * @return {Object}\n */\nexport function hideSettings() {\n\treturn {\n\t\ttype: types.SETTINGS_HIDE\n\t};\n}\n\n/**\n * Represents the user saving their settings.\n *\n * N.B. This action returns a Redux.Thunk not because it needs to perform\n * asynchronous work, but because it needs to query the global state for the\n * current enabled state. In order to keep the enabled state in a single\n * place (the preview reducer), we query it and dispatch it as `wasEnabled`\n * so that other reducers (like settings) can act on it without having to\n * duplicate the `enabled` state locally.\n * See docs/adr/0003-keep-enabled-state-only-in-preview-reducer.md for more\n * details.\n *\n * @param {boolean} enabled if previews are enabled or not\n * @return {Redux.Thunk}\n */\nexport function saveSettings( enabled ) {\n\treturn ( dispatch, getState ) => {\n\t\tdispatch( {\n\t\t\ttype: types.SETTINGS_CHANGE,\n\t\t\twasEnabled: getState().preview.enabled,\n\t\t\tenabled\n\t\t} );\n\t};\n}\n\n/**\n * Represents the queued event being logged `changeListeners/eventLogging.js`\n * change listener.\n *\n * @param {Object} event\n * @return {Object}\n */\nexport function eventLogged( event ) {\n\treturn {\n\t\ttype: types.EVENT_LOGGED,\n\t\tevent\n\t};\n}\n\n/**\n * Represents the queued statsv event being logged.\n * See `mw.popups.changeListeners.statsv` change listener.\n *\n * @return {Object}\n */\nexport function statsvLogged() {\n\treturn {\n\t\ttype: types.STATSV_LOGGED\n\t};\n}\n","/**\n * Creates the next state tree from the current state tree and some updates.\n *\n * N.B. OO.copy doesn't copy Element instances, whereas $.extend does.\n * However, OO.copy does copy properties whose values are undefined or null,\n * whereas $.extend doesn't. Since the state tree contains an Element instance\n * - the preview.activeLink property - and we want to copy undefined/null into\n * the state we need to manually iterate over updates and check with\n * hasOwnProperty to copy over to the new state.\n *\n * In [change listeners](/docs/change_listener.md), for example, we talk about\n * the previous state and the current state (the `prevState` and `state`\n * parameters, respectively). Since\n * [reducers](http://redux.js.org/docs/basics/Reducers.html) take the current\n * state and an action and make updates, \"next state\" seems appropriate.\n *\n * @param {Object} state\n * @param {Object} updates\n * @return {Object}\n */\nexport default function nextState( state, updates ) {\n\tconst result = {};\n\tconst hasOwn = Object.prototype.hasOwnProperty;\n\n\tfor ( const key in state ) {\n\t\tif ( hasOwn.call( state, key ) && !hasOwn.call( updates, key ) ) {\n\t\t\tresult[ key ] = state[ key ];\n\t\t}\n\t}\n\n\tfor ( const key in updates ) {\n\t\tif ( hasOwn.call( updates, key ) ) {\n\t\t\tresult[ key ] = updates[ key ];\n\t\t}\n\t}\n\n\treturn result;\n}\n","/**\n * @module reducers/eventLogging\n */\n\nimport actionTypes from '../actionTypes';\nimport nextState from './nextState';\nimport * as counts from '../counts';\n\n/**\n * Initialize the data that's shared between all events.\n *\n * @param {Object} bootAction\n * @return {Object}\n */\nfunction getBaseData( bootAction ) {\n\tconst result = {\n\t\tpageTitleSource: bootAction.page.title,\n\t\tnamespaceIdSource: bootAction.page.namespaceId,\n\t\tpageIdSource: bootAction.page.id,\n\t\tisAnon: bootAction.user.isAnon,\n\t\tpopupEnabled: bootAction.isEnabled,\n\t\tpageToken: bootAction.pageToken,\n\t\tsessionToken: bootAction.sessionToken,\n\t\tpreviewCountBucket: counts.getPreviewCountBucket(\n\t\t\tbootAction.user.previewCount\n\t\t),\n\t\thovercardsSuppressedByGadget: bootAction.isNavPopupsEnabled\n\t};\n\n\tif ( !bootAction.user.isAnon ) {\n\t\tresult.editCountBucket =\n\t\t\tcounts.getEditCountBucket( bootAction.user.editCount );\n\t}\n\n\treturn result;\n}\n\n/**\n * Takes data specific to the action and adds the following properties:\n *\n * * `linkInteractionToken`;\n * * `pageTitleHover` and `namespaceIdHover`; and\n * * `previewType` and `perceivedWait`, if a preview has been shown.\n *\n * The linkInteractionToken is renewed on each new preview dwelling unlike the pageToken which has a\n * lifespan tied to the pageview. It is erroneous to use the same linkInteractionToken across\n * multiple previews even if the previews are for the same link.\n *\n * @param {Object} interaction\n * @param {Object} actionData Data specific to the action, e.g. see\n *  {@link module:reducers/eventLogging~createClosingEvent `createClosingEvent`}\n * @return {Object}\n */\nfunction createEvent( interaction, actionData ) {\n\tactionData.linkInteractionToken = interaction.token;\n\tactionData.pageTitleHover = interaction.title;\n\tactionData.namespaceIdHover = interaction.namespaceId;\n\n\t// Has the preview been shown?\n\tif ( interaction.timeToPreviewShow !== undefined ) {\n\t\tactionData.previewType = interaction.previewType;\n\t\tactionData.perceivedWait = interaction.timeToPreviewShow;\n\t}\n\n\treturn actionData;\n}\n\n/**\n * Creates an event that, when mixed into the base data (see\n * {@link module:reducers/eventLogging~getBaseData `getBaseData`}), represents\n * the user abandoning a link or preview.\n *\n * Since the event should be logged when the user has either abandoned a link or\n * dwelled on a different link, we refer to these events as \"closing\" events as\n * the link interaction has finished and a new one will be created later.\n *\n * If the link interaction is finalized, then no closing event is created.\n *\n * @param {Object} interaction\n * @return {Object|undefined}\n */\nfunction createClosingEvent( interaction ) {\n\tconst actionData = {\n\t\ttotalInteractionTime:\n\t\t\tMath.round( interaction.finished - interaction.started )\n\t};\n\n\tif ( interaction.finalized ) {\n\t\treturn undefined;\n\t}\n\n\t// Has the preview been shown? If so, then, in the context of the\n\t// instrumentation, then the preview has been dismissed by the user\n\t// rather than the user has abandoned the link.\n\tactionData.action =\n\t\tinteraction.timeToPreviewShow ? 'dismissed' : 'dwelledButAbandoned';\n\n\treturn createEvent( interaction, actionData );\n}\n\n/**\n * Reducer for actions that may result in an event being logged with [the\n * Popups schema][0] via EventLogging.\n *\n * The complexity of this reducer reflects the complexity of [the schema][0],\n * which is compounded by the introduction of two delays introduced by the\n * system to provide reasonable performance and a consistent UX.\n *\n * The reducer must:\n *\n * * Accumulate the state required to log events. This state is\n *   referred to as \"the interaction state\" or \"the interaction\";\n * * Enforce the invariant that one event is logged per interaction;\n * * Defend against delayed actions being dispatched; and, as a direct\n *   consequence\n * * Handle transitioning from one interaction to another at the same time.\n *\n * Furthermore, we distinguish between \"finalizing\" and \"closing\" the current\n * interaction state. Since only one event should be logged per link\n * interaction, we say that the interaction state is *finalized* when an event\n * has been logged and is *closed* when a new interaction should be created.\n * In practice, the interaction state is only finalized when the user clicks a\n * link or a preview.\n *\n * [0]: https://meta.wikimedia.org/wiki/Schema:Popups\n *\n * @param {Object} state\n * @param {Object} action\n * @return {Object} The state resulting from reducing the action with the\n *  current state\n */\nexport default function eventLogging( state, action ) {\n\tlet nextCount, newState;\n\tconst actionTypesWithTokens = [\n\t\tactionTypes.FETCH_COMPLETE,\n\t\tactionTypes.ABANDON_END,\n\t\tactionTypes.PREVIEW_SHOW\n\t];\n\n\tif ( state === undefined ) {\n\t\tstate = {\n\t\t\tpreviewCount: undefined,\n\t\t\tbaseData: {},\n\t\t\tinteraction: undefined,\n\t\t\tevent: undefined\n\t\t};\n\t}\n\n\t// Was the action delayed? Then it requires a token to be reduced. Enforce\n\t// this here to avoid repetition and reduce nesting below.\n\tif (\n\t\tactionTypesWithTokens.indexOf( action.type ) !== -1 &&\n\t\t( !state.interaction || action.token !== state.interaction.token )\n\t) {\n\t\treturn state;\n\t}\n\n\t// If there is no interaction ongoing, ignore all actions except for:\n\t// * Application initialization\n\t// * New link dwells (which start a new interaction)\n\t// * Clearing queued events\n\t//\n\t// For example, after ctrl+clicking a link or preview, any other actions\n\t// until the new interaction should be ignored.\n\tif (\n\t\t!state.interaction &&\n\t\taction.type !== actionTypes.BOOT &&\n\t\taction.type !== actionTypes.LINK_DWELL &&\n\t\taction.type !== actionTypes.EVENT_LOGGED &&\n\t\taction.type !== actionTypes.SETTINGS_CHANGE\n\t) {\n\t\treturn state;\n\t}\n\tswitch ( action.type ) {\n\t\tcase actionTypes.BOOT:\n\t\t\treturn nextState( state, {\n\t\t\t\tpreviewCount: action.user.previewCount,\n\t\t\t\tbaseData: getBaseData( action ),\n\t\t\t\tevent: {\n\t\t\t\t\taction: 'pageLoaded'\n\t\t\t\t}\n\t\t\t} );\n\n\t\tcase actionTypes.EVENT_LOGGED:\n\t\t\tnewState = nextState( state, {\n\t\t\t\tevent: undefined\n\t\t\t} );\n\n\t\t\t// If an event was logged with an interaction token, and it is still\n\t\t\t// the current interaction, finish the interaction since logging is\n\t\t\t// the exit point of the state machine and an interaction should never\n\t\t\t// be logged twice.\n\t\t\tif (\n\t\t\t\taction.event.linkInteractionToken &&\n\t\t\t\tstate.interaction &&\n\t\t\t\t( action.event.linkInteractionToken === state.interaction.token )\n\t\t\t) {\n\t\t\t\tnewState.interaction = undefined;\n\t\t\t}\n\t\t\treturn newState;\n\n\t\tcase actionTypes.FETCH_COMPLETE:\n\t\t\treturn nextState( state, {\n\t\t\t\tinteraction: nextState( state.interaction, {\n\t\t\t\t\tpreviewType: action.result.type\n\t\t\t\t} )\n\t\t\t} );\n\n\t\tcase actionTypes.PREVIEW_SHOW:\n\t\t\tnextCount = state.previewCount + 1;\n\n\t\t\treturn nextState( state, {\n\t\t\t\tpreviewCount: nextCount,\n\t\t\t\tbaseData: nextState( state.baseData, {\n\t\t\t\t\tpreviewCountBucket: counts.getPreviewCountBucket( nextCount )\n\t\t\t\t} ),\n\t\t\t\tinteraction: nextState( state.interaction, {\n\t\t\t\t\ttimeToPreviewShow:\n\t\t\t\t\t\tMath.round( action.timestamp - state.interaction.started )\n\t\t\t\t} )\n\t\t\t} );\n\n\t\tcase actionTypes.LINK_DWELL:\n\n\t\t\t// Not a new interaction?\n\t\t\tif ( state.interaction && action.el === state.interaction.link ) {\n\t\t\t\treturn nextState( state, {\n\t\t\t\t\tinteraction: nextState( state.interaction, {\n\t\t\t\t\t\tisUserDwelling: true\n\t\t\t\t\t} )\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\treturn nextState( state, {\n\t\t\t\t// TODO: Extract this object into a module that can be shared between\n\t\t\t\t// this and the preview reducer.\n\t\t\t\tinteraction: {\n\t\t\t\t\tlink: action.el,\n\t\t\t\t\ttitle: action.title,\n\t\t\t\t\tnamespaceId: action.namespaceId,\n\t\t\t\t\ttoken: action.token,\n\t\t\t\t\tstarted: action.timestamp,\n\n\t\t\t\t\tisUserDwelling: true\n\t\t\t\t},\n\n\t\t\t\t// Was the user interacting with another link? If so, then log the\n\t\t\t\t// abandoned event.\n\t\t\t\tevent: state.interaction ?\n\t\t\t\t\tcreateClosingEvent( state.interaction ) : undefined\n\t\t\t} );\n\n\t\tcase actionTypes.PREVIEW_DWELL:\n\t\t\treturn nextState( state, {\n\t\t\t\tinteraction: nextState( state.interaction, {\n\t\t\t\t\tisUserDwelling: true\n\t\t\t\t} )\n\t\t\t} );\n\n\t\tcase actionTypes.LINK_CLICK:\n\t\t\treturn nextState( state, {\n\t\t\t\tinteraction: nextState( state.interaction, {\n\t\t\t\t\tfinalized: true\n\t\t\t\t} ),\n\t\t\t\tevent: createEvent( state.interaction, {\n\t\t\t\t\taction: 'opened',\n\t\t\t\t\ttotalInteractionTime:\n\t\t\t\t\t\tMath.round( action.timestamp - state.interaction.started )\n\t\t\t\t} )\n\t\t\t} );\n\n\t\tcase actionTypes.ABANDON_START:\n\t\t\treturn nextState( state, {\n\t\t\t\tinteraction: nextState( state.interaction, {\n\t\t\t\t\tfinished: action.timestamp,\n\n\t\t\t\t\tisUserDwelling: false\n\t\t\t\t} )\n\t\t\t} );\n\n\t\tcase actionTypes.ABANDON_END:\n\t\t\tif ( !state.interaction.isUserDwelling ) {\n\t\t\t\treturn nextState( state, {\n\t\t\t\t\tinteraction: undefined,\n\t\t\t\t\tevent: createClosingEvent( state.interaction )\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\treturn state;\n\n\t\tcase actionTypes.SETTINGS_SHOW:\n\t\t\treturn nextState( state, {\n\t\t\t\tevent: createEvent( state.interaction, {\n\t\t\t\t\taction: 'tapped settings cog'\n\t\t\t\t} )\n\t\t\t} );\n\n\t\tcase actionTypes.SETTINGS_CHANGE:\n\t\t\tif ( action.wasEnabled && !action.enabled ) {\n\t\t\t\treturn nextState( state, {\n\t\t\t\t\tevent: {\n\t\t\t\t\t\taction: 'disabled',\n\t\t\t\t\t\tpopupEnabled: false\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t} else {\n\t\t\t\treturn state;\n\t\t\t}\n\t\tdefault:\n\t\t\treturn state;\n\t}\n}\n","import eventLogging from './eventLogging';\nimport pageviews from './pageviews';\nimport preview from './preview';\nimport settings from './settings';\nimport statsv from './statsv';\n\nexport default {\n\teventLogging,\n\tpageviews,\n\tpreview,\n\tsettings,\n\tstatsv\n};\n","/**\n * @module reducers/pageviews\n */\n\nimport actionTypes from '../actionTypes';\nimport nextState from './nextState';\n\n/**\n * Reducer for actions that queues and clears events for\n * being logged as virtual pageviews [0]\n *\n * [0]: https://meta.wikimedia.org/wiki/Schema:VirtualPageViews\n *\n * @param {Object} state\n * @param {Object} action\n * @return {Object} The state resulting from reducing the action with the\n *  current state\n */\nexport default function pageviews( state, action ) {\n\tif ( state === undefined ) {\n\t\tstate = {\n\t\t\tpageview: undefined\n\t\t};\n\t}\n\n\tswitch ( action.type ) {\n\t\tcase actionTypes.BOOT:\n\t\t\treturn nextState( state, {\n\t\t\t\tpage: action.page\n\t\t\t} );\n\t\tcase actionTypes.PAGEVIEW_LOGGED:\n\t\t\treturn nextState( state, {\n\t\t\t\tpageview: undefined\n\t\t\t} );\n\t\tcase actionTypes.PREVIEW_SEEN:\n\t\t\treturn nextState( state, {\n\t\t\t\tpageview: {\n\t\t\t\t\t/* eslint-disable camelcase */\n\t\t\t\t\tpage_title: action.title,\n\t\t\t\t\tpage_id: action.pageId,\n\t\t\t\t\tpage_namespace: action.namespace\n\t\t\t\t\t/* eslint-enable camelcase */\n\t\t\t\t}\n\t\t\t} );\n\t\tdefault:\n\t\t\treturn state;\n\t}\n}\n","import actionTypes from '../actionTypes';\nimport nextState from './nextState';\n\n/**\n * Reducer for actions that modify the state of the preview model\n *\n * @param {Object|undefined} state before action\n * @param {Object} action Redux action that modified state.\n *  Must have `type` property.\n * @return {Object} state after action\n */\nexport default function preview( state, action ) {\n\tif ( state === undefined ) {\n\t\tstate = {\n\t\t\tenabled: undefined,\n\t\t\tactiveLink: undefined,\n\t\t\tmeasures: undefined,\n\t\t\tactiveToken: '',\n\t\t\tshouldShow: false,\n\t\t\tisUserDwelling: false,\n\t\t\twasClicked: false\n\t\t};\n\t}\n\n\tswitch ( action.type ) {\n\t\tcase actionTypes.BOOT:\n\t\t\treturn nextState( state, {\n\t\t\t\tenabled: action.isEnabled\n\t\t\t} );\n\n\t\tcase actionTypes.SETTINGS_CHANGE:\n\t\t\treturn nextState( state, {\n\t\t\t\tenabled: action.enabled\n\t\t\t} );\n\n\t\tcase actionTypes.LINK_DWELL:\n\t\t\tif ( action.el !== state.activeLink ) {\n\t\t\t\t// New interaction\n\t\t\t\treturn nextState( state, {\n\t\t\t\t\tactiveLink: action.el,\n\t\t\t\t\tmeasures: action.measures,\n\t\t\t\t\tactiveToken: action.token,\n\n\t\t\t\t\t// When the user dwells on a link with their keyboard, a preview is\n\t\t\t\t\t// renderered, and then dwells on another link, the ABANDON_END\n\t\t\t\t\t// action will be ignored.\n\t\t\t\t\t//\n\t\t\t\t\t// Ensure that all the preview is hidden.\n\t\t\t\t\tshouldShow: false,\n\n\t\t\t\t\tisUserDwelling: true,\n\t\t\t\t\tpromise: action.promise\n\t\t\t\t} );\n\t\t\t}\n\t\t\t// Dwelling back into the same link.\n\t\t\treturn nextState( state, {\n\t\t\t\tisUserDwelling: true\n\t\t\t} );\n\n\t\tcase actionTypes.FETCH_ABORTED:\n\t\tcase actionTypes.ABANDON_END:\n\t\t\tif ( action.token === state.activeToken && !state.isUserDwelling ) {\n\t\t\t\treturn nextState( state, {\n\t\t\t\t\tactiveLink: undefined,\n\t\t\t\t\tactiveToken: undefined,\n\t\t\t\t\tmeasures: undefined,\n\t\t\t\t\tfetchResponse: undefined,\n\t\t\t\t\tshouldShow: false\n\t\t\t\t} );\n\t\t\t}\n\t\t\treturn state;\n\n\t\tcase actionTypes.PREVIEW_DWELL:\n\t\t\treturn nextState( state, {\n\t\t\t\tisUserDwelling: true\n\t\t\t} );\n\n\t\tcase actionTypes.ABANDON_START:\n\t\t\treturn nextState( state, {\n\t\t\t\tisUserDwelling: false,\n\t\t\t\twasClicked: false\n\t\t\t} );\n\n\t\tcase actionTypes.FETCH_START:\n\t\t\treturn nextState( state, {\n\t\t\t\tfetchResponse: undefined,\n\t\t\t\tpromise: action.promise\n\t\t\t} );\n\n\t\tcase actionTypes.FETCH_COMPLETE:\n\t\t\tif ( action.token === state.activeToken ) {\n\t\t\t\treturn nextState( state, {\n\t\t\t\t\tfetchResponse: action.result,\n\t\t\t\t\tshouldShow: state.isUserDwelling\n\t\t\t\t} );\n\t\t\t} // else fall through\n\t\tdefault:\n\t\t\treturn state;\n\t}\n}\n","import actionTypes from '../actionTypes';\nimport nextState from './nextState';\n\n/**\n * Reducer for actions that modify the state of the settings\n *\n * @param {Object} state\n * @param {Object} action\n * @return {Object} state after action\n */\nexport default function settings( state, action ) {\n\tif ( state === undefined ) {\n\t\tstate = {\n\t\t\tshouldShow: false,\n\t\t\tshowHelp: false,\n\t\t\tshouldShowFooterLink: false\n\t\t};\n\t}\n\n\tswitch ( action.type ) {\n\t\tcase actionTypes.SETTINGS_SHOW:\n\t\t\treturn nextState( state, {\n\t\t\t\tshouldShow: true,\n\t\t\t\tshowHelp: false\n\t\t\t} );\n\t\tcase actionTypes.SETTINGS_HIDE:\n\t\t\treturn nextState( state, {\n\t\t\t\tshouldShow: false,\n\t\t\t\tshowHelp: false\n\t\t\t} );\n\t\tcase actionTypes.SETTINGS_CHANGE:\n\t\t\treturn action.wasEnabled === action.enabled ?\n\t\t\t\t// If the setting is the same, just hide the dialogs\n\t\t\t\tnextState( state, {\n\t\t\t\t\tshouldShow: false\n\t\t\t\t} ) :\n\t\t\t\t// If the settings have changed...\n\t\t\t\tnextState( state, {\n\t\t\t\t\t// If we enabled, we just hide directly, no help\n\t\t\t\t\t// If we disabled, keep it showing and let the ui show the help.\n\t\t\t\t\tshouldShow: !action.enabled,\n\t\t\t\t\tshowHelp: !action.enabled,\n\n\t\t\t\t\t// Since the footer link is only ever shown to anonymous users (see\n\t\t\t\t\t// the BOOT case below), state.userIsAnon is always truthy here.\n\t\t\t\t\tshouldShowFooterLink: !action.enabled\n\t\t\t\t} );\n\n\t\tcase actionTypes.BOOT:\n\t\t\treturn nextState( state, {\n\t\t\t\tshouldShowFooterLink: action.user.isAnon && !action.isEnabled\n\t\t\t} );\n\t\tdefault:\n\t\t\treturn state;\n\t}\n}\n","import actionTypes from './../actionTypes';\nimport nextState from './nextState';\n\n/**\n * Reducer for actions that may result in an event being logged via statsv.\n *\n * @param {Object} state\n * @param {Object} action\n * @return {Object} state after action\n */\nexport default function statsv( state, action ) {\n\tstate = state || {};\n\n\tswitch ( action.type ) {\n\t\tcase actionTypes.FETCH_START:\n\t\t\treturn nextState( state, {\n\t\t\t\tfetchStartedAt: action.timestamp\n\t\t\t} );\n\n\t\tcase actionTypes.FETCH_END:\n\t\t\treturn nextState( state, {\n\t\t\t\taction: 'timing.PagePreviewsApiResponse',\n\t\t\t\tdata: action.timestamp - state.fetchStartedAt\n\t\t\t} );\n\n\t\tcase actionTypes.FETCH_FAILED:\n\t\t\treturn nextState( state, {\n\t\t\t\taction: 'counter.PagePreviewsApiFailure',\n\t\t\t\tdata: 1\n\t\t\t} );\n\n\t\tcase actionTypes.LINK_DWELL:\n\t\t\treturn nextState( state, {\n\t\t\t\tlinkDwellStartedAt: action.timestamp\n\t\t\t} );\n\n\t\tcase actionTypes.PREVIEW_SHOW:\n\t\t\treturn nextState( state, {\n\t\t\t\taction: 'timing.PagePreviewsPreviewShow',\n\t\t\t\tdata: action.timestamp - state.linkDwellStartedAt\n\t\t\t} );\n\n\t\tcase actionTypes.STATSV_LOGGED:\n\t\t\treturn nextState( state, {\n\t\t\t\taction: null,\n\t\t\t\tdata: null\n\t\t\t} );\n\n\t\tdefault:\n\t\t\treturn state;\n\t}\n}\n","/**\n * @module getPageviewTracker\n */\n\n/**\n * @typedef {Object} MwCodeLoader\n *\n * Loads code from the server to the client on demand.\n *\n * @param {Array} dependencies to load\n * @return {JQuery.Deferred} resolving when the code is loaded and\n *   can be used by the client.\n *\n * @global\n */\n\n/**\n * Convert the first letter of a string to uppercase.\n *\n * @param {string} word\n * @return {string}\n */\nfunction titleCase( word ) {\n\treturn word[ 0 ].toUpperCase() + word.slice( 1 );\n}\n\n/**\n * Truncates a string to a maximum length based on its URI encoded value.\n *\n * @param {string} sourceUrl source string\n * @param {number} maxLength maximum length\n * @return {string} string is returned in the same encoding as the input\n */\nfunction limitByEncodedURILength( sourceUrl, maxLength ) {\n\tlet truncatedUrl = '';\n\n\tsourceUrl.split( '' ).every( ( char ) => {\n\t\treturn ( encodeURIComponent( truncatedUrl + char ).length < maxLength ) ?\n\t\t\t( truncatedUrl += char ) :\n\t\t\tfalse;\n\t} );\n\treturn truncatedUrl;\n}\n\n/**\n * Convert Title properties into mediawiki canonical form\n * and limit the length of source_url.\n *\n * @param {Object} eventData\n * @return {Object}\n */\nfunction prepareEventData( eventData ) {\n\tconst data = eventData;\n\t/* eslint-disable camelcase */\n\tdata.source_title = mw.Title.newFromText( eventData.source_title )\n\t\t.getPrefixedDb();\n\tdata.page_title = mw.Title.newFromText( eventData.page_title )\n\t\t.getPrefixedDb();\n\t// prevent source_url from exceeding varnish max-url size - T196904\n\tdata.source_url = limitByEncodedURILength( eventData.source_url, 1000 );\n\n\t/* eslint-enable camelcase */\n\treturn data;\n}\n\n/**\n * Gets the appropriate analytics event tracker for logging virtual pageviews.\n * Note this bypasses EventLogging in order to track virtual pageviews\n * for pages where the DNT header (do not track) has been added.\n * This is explained in https://phabricator.wikimedia.org/T187277.\n *\n * @param {Object} config\n * @param {MwCodeLoader} loader that can source code that obeys the\n *  EventLogging api specification.\n * @param {Function} trackerGetter when called returns an instance\n *  of MediaWiki's EventLogging client\n * @param {Function} sendBeacon see\n *  https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon\n * @return {EventTracker}\n */\nfunction getPageviewTracker( config, loader, trackerGetter, sendBeacon ) {\n\tconst pageviewTracker = function ( topic, eventData ) {\n\t\tconst schema = titleCase( topic.slice( topic.indexOf( '.' ) + 1 ) );\n\t\tconst dependencies = [ 'ext.eventLogging' ];\n\t\treturn loader( dependencies ).then( function () {\n\t\t\tconst evLog = trackerGetter();\n\t\t\tconst payload = evLog.prepare( schema, prepareEventData( eventData ) );\n\t\t\tconst url = evLog.makeBeaconUrl( payload );\n\t\t\tsendBeacon( url );\n\t\t} );\n\t};\n\treturn config.get( 'wgPopupsVirtualPageViews' ) ? pageviewTracker : () => {};\n}\n\n/**\n * Gets a function that can asynchronously transfer a small amount of data\n * over HTTP to a web server.\n *\n * @param {Window.Navigator} navigatorObj\n * @return {Function}\n */\nfunction getSendBeacon( navigatorObj ) {\n\treturn navigatorObj.sendBeacon ?\n\t\tnavigatorObj.sendBeacon.bind( navigatorObj ) :\n\t\t( url ) => {\n\t\t\tdocument.createElement( 'img' ).src = url;\n\t\t};\n}\n\nexport { getSendBeacon, limitByEncodedURILength };\nexport default getPageviewTracker;\n","/**\n * @module setUserConfigFlags\n */\n\n/**\n * Same as in includes/PopupsContext.php\n */\nconst NAV_POPUPS_ENABLED = 1,\n\tREF_TOOLTIPS_ENABLED = 2,\n\tREFERENCE_PREVIEWS_ENABLED = 4,\n\tREFERENCE_PREVIEWS_BETA = 8;\n\n/**\n * Decodes the bitmask that represents preferences to the related config options.\n *\n * @param {mw.Map} config\n */\nexport default function setUserConfigFlags( config ) {\n\tconst popupsFlags = parseInt( config.get( 'wgPopupsFlags' ), 10 );\n\n\t/* eslint-disable no-bitwise */\n\tconfig.set(\n\t\t'wgPopupsConflictsWithNavPopupGadget',\n\t\t!!( popupsFlags & NAV_POPUPS_ENABLED )\n\t);\n\tconfig.set(\n\t\t'wgPopupsConflictsWithRefTooltipsGadget',\n\t\t!!( popupsFlags & REF_TOOLTIPS_ENABLED )\n\t);\n\tconfig.set(\n\t\t'wgPopupsReferencePreviews',\n\t\t!!( popupsFlags & REFERENCE_PREVIEWS_ENABLED )\n\t);\n\tconfig.set(\n\t\t'wgPopupsReferencePreviewsBeta',\n\t\t!!( popupsFlags & REFERENCE_PREVIEWS_BETA )\n\t);\n\t/* eslint-enable no-bitwise */\n}\n","/**\n * @module popups\n */\n\nimport * as Redux from 'redux';\nimport * as ReduxThunk from 'redux-thunk';\n\nimport createPagePreviewGateway from './gateway/page';\nimport createReferenceGateway from './gateway/reference';\nimport createUserSettings from './userSettings';\nimport createPreviewBehavior from './previewBehavior';\nimport createSettingsDialogRenderer from './ui/settingsDialogRenderer';\nimport registerChangeListener from './changeListener';\nimport createIsEnabled from './isEnabled';\nimport { fromElement as titleFromElement } from './title';\nimport { init as rendererInit } from './ui/renderer';\nimport createExperiments from './experiments';\nimport { isEnabled as isStatsvEnabled } from './instrumentation/statsv';\nimport { isEnabled as isEventLoggingEnabled }\n\tfrom './instrumentation/eventLogging';\nimport changeListeners from './changeListeners';\nimport * as actions from './actions';\nimport reducers from './reducers';\nimport createMediaWikiPopupsObject from './integrations/mwpopups';\nimport getPageviewTracker, { getSendBeacon } from './getPageviewTracker';\nimport { previewTypes, getPreviewType } from './preview/model';\nimport isReferencePreviewsEnabled from './isReferencePreviewsEnabled';\nimport setUserConfigFlags from './setUserConfigFlags';\n\nconst EXCLUDED_LINK_SELECTORS = [\n\t'.extiw',\n\t'.image',\n\t'.new',\n\t'.internal',\n\t'.external',\n\t'.mw-cite-backlink a',\n\t'.oo-ui-buttonedElement-button',\n\t'.ve-ce-surface a', // T259889\n\t'.cancelLink a'\n];\n\n/**\n * @typedef {Function} EventTracker\n *\n * An analytics event tracker, i.e. `mw.track`.\n *\n * @param {string} topic\n * @param {Object} data\n *\n * @global\n */\n\n/**\n * Gets the appropriate analytics event tracker for logging metrics to StatsD\n * via [the \"StatsD timers and counters\" analytics event protocol][0].\n *\n * If logging metrics to StatsD is enabled for the duration of the user's\n * session, then the appriopriate function is `mw.track`; otherwise it's\n * `() => {}`.\n *\n * [0]: https://github.com/wikimedia/mediawiki-extensions-WikimediaEvents/blob/29c864a0/modules/ext.wikimediaEvents.statsd.js\n *\n * @param {Object} user\n * @param {Object} config\n * @param {Experiments} experiments\n * @return {EventTracker}\n */\nfunction getStatsvTracker( user, config, experiments ) {\n\treturn isStatsvEnabled( user, config, experiments ) ? mw.track : () => {};\n}\n\n/**\n * Gets the appropriate analytics event tracker for logging EventLogging events\n * via [the \"EventLogging subscriber\" analytics event protocol][0].\n *\n * If logging EventLogging events is enabled for the duration of the user's\n * session, then the appriopriate function is `mw.track`; otherwise it's\n * `() => {}`.\n *\n * [0]: https://github.com/wikimedia/mediawiki-extensions-EventLogging/blob/d1409759/modules/ext.eventLogging.subscriber.js\n *\n * @param {Object} user\n * @param {Object} config\n * @param {Window} window\n * @return {EventTracker}\n */\nfunction getEventLoggingTracker( user, config, window ) {\n\treturn isEventLoggingEnabled(\n\t\tuser,\n\t\tconfig,\n\t\twindow\n\t) ? mw.track : () => {};\n}\n\n/**\n * Returns timestamp since the beginning of the current document's origin\n * as reported by `window.performance.now()`. See\n * https://developer.mozilla.org/en-US/docs/Web/API/DOMHighResTimeStamp#The_time_origin\n * for a detailed explanation of the time origin.\n *\n * The value returned by this function is used for [the `timestamp` property\n * of the Schema:Popups events sent by the EventLogging\n * instrumentation](./src/changeListeners/eventLogging.js).\n *\n * @return {number|null}\n */\nfunction getCurrentTimestamp() {\n\tif ( window.performance && window.performance.now ) {\n\t\t// return an integer; see T182000\n\t\treturn Math.round( window.performance.now() );\n\t}\n\treturn null;\n}\n\n/**\n * Subscribes the registered change listeners to the\n * [store](http://redux.js.org/docs/api/Store.html#store).\n *\n * @param {Redux.Store} store\n * @param {Object} registerActions\n * @param {UserSettings} userSettings\n * @param {Function} settingsDialog\n * @param {PreviewBehavior} previewBehavior\n * @param {EventTracker} statsvTracker\n * @param {EventTracker} eventLoggingTracker\n * @param {EventTracker} pageviewTracker\n * @param {Function} callbackCurrentTimestamp\n * @return {void}\n */\nfunction registerChangeListeners(\n\tstore, registerActions, userSettings, settingsDialog, previewBehavior,\n\tstatsvTracker, eventLoggingTracker, pageviewTracker, callbackCurrentTimestamp\n) {\n\tregisterChangeListener( store, changeListeners.footerLink( registerActions ) );\n\tregisterChangeListener( store, changeListeners.linkTitle() );\n\tregisterChangeListener( store, changeListeners.render( previewBehavior ) );\n\tregisterChangeListener(\n\t\tstore, changeListeners.statsv( registerActions, statsvTracker ) );\n\tregisterChangeListener(\n\t\tstore, changeListeners.syncUserSettings( userSettings ) );\n\tregisterChangeListener(\n\t\tstore, changeListeners.settings( registerActions, settingsDialog ) );\n\tregisterChangeListener(\n\t\tstore,\n\t\tchangeListeners.eventLogging(\n\t\t\tregisterActions, eventLoggingTracker, callbackCurrentTimestamp\n\t\t) );\n\tregisterChangeListener( store,\n\t\tchangeListeners.pageviews( registerActions, pageviewTracker )\n\t);\n}\n\n/*\n * Initialize the application by:\n * 1. Initializing side-effects and \"services\"\n * 2. Creating the state store\n * 3. Binding the actions to such store\n * 4. Registering change listeners\n * 5. Triggering the boot action to bootstrap the system\n * 6. When the page content is ready:\n *   - Initializing the renderer\n *   - Binding hover and click events to the eligible links to trigger actions\n */\n( function init() {\n\tsetUserConfigFlags( mw.config );\n\n\tlet compose = Redux.compose;\n\tconst\n\t\t// So-called \"services\".\n\t\tgenerateToken = mw.user.generateRandomSessionId,\n\t\tpagePreviewGateway = createPagePreviewGateway( mw.config ),\n\t\treferenceGateway = createReferenceGateway(),\n\t\tuserSettings = createUserSettings( mw.storage ),\n\t\tsettingsDialog = createSettingsDialogRenderer( mw.config ),\n\t\texperiments = createExperiments( mw.experiments ),\n\t\tstatsvTracker = getStatsvTracker( mw.user, mw.config, experiments ),\n\t\t// Virtual pageviews are always tracked.\n\t\tpageviewTracker = getPageviewTracker( mw.config,\n\t\t\tmw.loader.using,\n\t\t\t() => mw.eventLog,\n\t\t\tgetSendBeacon( window.navigator )\n\t\t),\n\t\teventLoggingTracker = getEventLoggingTracker(\n\t\t\tmw.user,\n\t\t\tmw.config,\n\t\t\twindow\n\t\t),\n\t\tisEnabled = createIsEnabled( mw.user, userSettings, mw.config );\n\n\t// If debug mode is enabled, then enable Redux DevTools.\n\tif ( mw.config.get( 'debug' ) === true ||\n\t\t/* global process */\n\t\tprocess.env.NODE_ENV !== 'production' ) {\n\t\t// eslint-disable-next-line no-underscore-dangle\n\t\tcompose = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;\n\t}\n\n\tconst store = Redux.createStore(\n\t\tRedux.combineReducers( reducers ),\n\t\tcompose( Redux.applyMiddleware(\n\t\t\tReduxThunk.default\n\t\t) )\n\t);\n\tconst boundActions = Redux.bindActionCreators( actions, store.dispatch );\n\tconst previewBehavior = createPreviewBehavior( mw.user, boundActions );\n\n\tregisterChangeListeners(\n\t\tstore, boundActions, userSettings, settingsDialog,\n\t\tpreviewBehavior, statsvTracker, eventLoggingTracker,\n\t\tpageviewTracker,\n\t\tgetCurrentTimestamp\n\t);\n\n\tboundActions.boot(\n\t\tisEnabled,\n\t\tmw.user,\n\t\tuserSettings,\n\t\tmw.config,\n\t\twindow.location.href\n\t);\n\n\t/*\n\t * Register external interface exposing popups internals so that other\n\t * extensions can query it (T171287)\n\t */\n\tmw.popups = createMediaWikiPopupsObject( store );\n\n\tconst selectors = [];\n\tif ( mw.user.isAnon() || mw.user.options.get( 'popups' ) === '1' ) {\n\t\tconst excludedLinksSelector = EXCLUDED_LINK_SELECTORS.join( ', ' );\n\t\tselectors.push( `#mw-content-text a[href][title]:not(${excludedLinksSelector})` );\n\t}\n\tif ( isReferencePreviewsEnabled( mw.config ) ) {\n\t\tselectors.push( '#mw-content-text .reference a[ href*=\"#\" ]' );\n\t}\n\tif ( !selectors.length ) {\n\t\tmw.log.error( 'ext.popups should not even be loaded!' );\n\t\treturn;\n\t}\n\tconst validLinkSelector = selectors.join( ', ' );\n\n\trendererInit();\n\n\t/*\n\t * Binding hover and click events to the eligible links to trigger actions\n\t */\n\t$( document )\n\t\t.on( 'mouseover keyup', validLinkSelector, function ( event ) {\n\t\t\tconst mwTitle = titleFromElement( this, mw.config );\n\t\t\tif ( !mwTitle ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tconst type = getPreviewType( this, mw.config, mwTitle );\n\t\t\tlet gateway;\n\n\t\t\tswitch ( type ) {\n\t\t\t\tcase previewTypes.TYPE_PAGE:\n\t\t\t\t\tgateway = pagePreviewGateway;\n\t\t\t\t\tbreak;\n\t\t\t\tcase previewTypes.TYPE_REFERENCE:\n\t\t\t\t\tgateway = referenceGateway;\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst $target = $( this );\n\t\t\tconst $window = $( window );\n\n\t\t\tconst measures = {\n\t\t\t\tpageX: event.pageX,\n\t\t\t\tpageY: event.pageY,\n\t\t\t\tclientY: event.clientY,\n\t\t\t\twidth: $target.width(),\n\t\t\t\theight: $target.height(),\n\t\t\t\toffset: $target.offset(),\n\t\t\t\tclientRects: this.getClientRects(),\n\t\t\t\twindowWidth: $window.width(),\n\t\t\t\twindowHeight: $window.height(),\n\t\t\t\tscrollTop: $window.scrollTop()\n\t\t\t};\n\n\t\t\tboundActions.linkDwell( mwTitle, this, measures, gateway, generateToken, type );\n\t\t} )\n\t\t.on( 'mouseout blur', validLinkSelector, function () {\n\t\t\tconst mwTitle = titleFromElement( this, mw.config );\n\n\t\t\tif ( mwTitle ) {\n\t\t\t\tboundActions.abandon();\n\t\t\t}\n\t\t} )\n\t\t.on( 'click', validLinkSelector, function () {\n\t\t\tconst mwTitle = titleFromElement( this, mw.config );\n\t\t\tif ( mwTitle ) {\n\t\t\t\tif ( previewTypes.TYPE_PAGE === getPreviewType( this, mw.config, mwTitle ) ) {\n\t\t\t\t\tboundActions.linkClick( this );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n}() );\n\nwindow.Redux = Redux;\nwindow.ReduxThunk = ReduxThunk;\n","/**\n * @module experiments\n */\n\n/**\n * @interface Experiments\n *\n * @global\n */\n\n/**\n * Creates a helper wrapper for the MediaWiki-provided\n * `mw.experiments#getBucket` bucketing function.\n *\n * @param {mw.experiments} mwExperiments The `mw.experiments` singleton instance\n * @return {Experiments}\n */\nexport default function createExperiments( mwExperiments ) {\n\treturn {\n\t\t/**\n\t\t * Gets whether something is true given a name and a token.\n\t\t *\n\t\t * @example\n\t\t * import createExperiments from './src/experiments';\n\t\t * const experiments = createExperiments( mw.experiments );\n\t\t * const isFooEnabled = experiments.weightedBoolean(\n\t\t *   'foo',\n\t\t *   10 / 100, // 10% of all unique tokens should have foo enabled.\n\t\t *   token\n\t\t * );\n\t\t *\n\t\t * @method\n\t\t * @name Experiments#weightedBoolean\n\t\t * @param {string} name The name of the thing. Since this is used as the\n\t\t *  name of the underlying experiment it should be unique to reduce the\n\t\t *  likelihood of collisions with other enabled experiments\n\t\t * @param {number} trueWeight A number between 0 and 1, representing the\n\t\t *  probability of the thing being true\n\t\t * @param {string} token A token associated with the user for the duration\n\t\t *  of the experiment\n\t\t * @return {boolean}\n\t\t */\n\t\tweightedBoolean( name, trueWeight, token ) {\n\t\t\treturn mwExperiments.getBucket( {\n\t\t\t\tenabled: true,\n\n\t\t\t\tname,\n\t\t\t\tbuckets: {\n\t\t\t\t\ttrue: trueWeight,\n\t\t\t\t\tfalse: 1 - trueWeight\n\t\t\t\t}\n\t\t\t}, token ) === 'true';\n\t\t}\n\t};\n}\n","/**\n * @module instrumentation/statsv\n */\n\n/**\n * Gets whether Graphite logging (via [the statsv HTTP endpoint][0]) is enabled\n * for the duration of the user's session. The bucketing rate is controlled by\n * `wgPopupsStatsvSamplingRate`.\n *\n * [0]: https://wikitech.wikimedia.org/wiki/Graphite#statsv\n *\n * @param {mw.user} user The `mw.user` singleton instance\n * @param {mw.Map} config The `mw.config` singleton instance\n * @param {Experiments} experiments\n * @return {boolean}\n */\nexport function isEnabled( user, config, experiments ) {\n\tconst bucketingRate = config.get( 'wgPopupsStatsvSamplingRate', 0 );\n\n\treturn experiments.weightedBoolean(\n\t\t'ext.Popups.statsv',\n\t\tbucketingRate,\n\t\tuser.sessionId()\n\t);\n}\n","/**\n * @module instrumentation/eventLogging\n */\n\n/**\n * Gets whether EventLogging logging is enabled for the duration of the user's\n * session.\n * If wgPopupsEventLogging is false this will return false unless debug=true has\n * been enabled.\n * However, if the UA doesn't support [the Beacon API][1], then bucketing is\n * disabled.\n *\n * [1]: https://w3c.github.io/beacon/\n *\n * @param {mw.user} user The `mw.user` singleton instance\n * @param {mw.Map} config The `mw.config` singleton instance\n * @param {Window} window\n * @return {boolean}\n */\nexport function isEnabled( user, config, window ) {\n\t// if debug mode is on, always enable event logging. @see T168847\n\tif ( config.get( 'debug' ) === true ) {\n\t\treturn true;\n\t}\n\n\treturn config.get( 'wgPopupsEventLogging' ) &&\n\t\twindow.navigator &&\n\t\ttypeof window.navigator.sendBeacon === 'function';\n}\n","/**\n * @module isEnabled\n */\n\n/**\n * Given the global state of the application, creates a function that gets\n * whether or not the user should have Page Previews enabled.\n *\n * Page Previews is disabled when the Navigation Popups gadget is enabled.\n *\n * If Page Previews is configured as a user preference, then the user must\n * either be logged in and have enabled the preference or be logged out and have\n * not disabled previews via the settings modal.\n *\n * @param {mw.user} user The `mw.user` singleton instance\n * @param {Object} userSettings An object returned by `userSettings.js`\n * @param {mw.Map} config\n *\n * @return {boolean}\n */\nexport default function isEnabled( user, userSettings, config ) {\n\tif ( config.get( 'wgPopupsConflictsWithNavPopupGadget' ) ) {\n\t\treturn false;\n\t}\n\n\tif ( !user.isAnon() ) {\n\t\t// For logged-in users, enablement is equal to the\n\t\t// loading of this very code.\n\t\treturn true;\n\t} else {\n\t\t// For anonymous users, the code loads always, but the feature\n\t\t// can be toggled at run-time via local storage.\n\t\tif ( !userSettings.hasIsEnabled() ) {\n\t\t\t// Default when no setting is stored.\n\t\t\treturn true;\n\t\t} else {\n\t\t\treturn userSettings.getIsEnabled();\n\t\t}\n\t}\n}\n","/**\n * @module previewBehaviour\n */\n\n/**\n * A collection of event handlers specific to how the user interacts with all\n * previews. The event handlers  are are agnostic to how/when they are bound\n * //but not to what they are bound//, i.e. the showSettings event handler is\n * written to be bound to either an `<a>` or `<button>` element.\n *\n * @typedef {Object} ext.popups.PreviewBehavior\n * @property {string} settingsUrl\n * @property {Function} showSettings\n * @property {Function} previewDwell\n * @property {Function} previewAbandon\n * @property {Function} previewShow\n * @property {Function} click handler for the entire preview\n */\n\n/**\n * Creates an instance of `ext.popups.PreviewBehavior`.\n *\n * If the user is logged out, then clicking the cog should show the settings\n * modal.\n *\n * If the user is logged in, then clicking the cog should send them to the\n * the \"Appearance\" tab otherwise.\n *\n * @param {mw.User} user\n * @param {Object} actions The action creators bound to the Redux store\n * @return {ext.popups.PreviewBehavior}\n */\nexport default function createPreviewBehavior( user, actions ) {\n\tlet settingsUrl, showSettings = () => {};\n\n\tif ( user.isAnon() ) {\n\t\tshowSettings = ( event ) => {\n\t\t\tevent.preventDefault();\n\n\t\t\tactions.showSettings();\n\t\t};\n\t} else {\n\t\tconst rawTitle = 'Special:Preferences#mw-prefsection-rendering';\n\n\t\tsettingsUrl = mw.Title.newFromText( rawTitle )\n\t\t\t.getUrl();\n\t}\n\n\treturn {\n\t\tsettingsUrl,\n\t\tshowSettings,\n\t\tpreviewDwell: actions.previewDwell,\n\t\tpreviewAbandon: actions.abandon,\n\t\tpreviewShow: actions.previewShow,\n\t\tclick: actions.linkClick\n\t};\n}\n","/**\n * @module MediaWiki-Popups Integration\n */\n\n/**\n * This function provides a mw.popups object which can be used by 3rd party\n * to interact with Popups. Currently it allows only to read isEnabled flag.\n *\n * @param {Redux.Store} store Popups store\n * @return {Object} external Popups interface\n */\nexport default function createMwPopups( store ) {\n\treturn {\n\t\tisEnabled: function isEnabled() {\n\t\t\treturn store.getState().preview.enabled;\n\t\t}\n\t};\n\n}\n","/**\n * @module isReferencePreviewsEnabled\n */\n\n/**\n * Given the global state of the application, creates a function that gets\n * whether or not the user should have Reference Previews enabled.\n *\n * @param {mw.Map} config\n *\n * @return {boolean}\n */\nexport default function isReferencePreviewsEnabled( config ) {\n\treturn (\n\t\t// TODO: Replace with mw.user.options.get( 'popupsreferencepreviews' ) === '1'\n\t\t// when not in Beta any more, and the temporary feature flag is not needed any more.\n\t\tconfig.get( 'wgPopupsReferencePreviews' ) &&\n\t\t// T265872: Show popup if there is no conflict with the reference tooltips gadget\n\t\t!config.get( 'wgPopupsConflictsWithRefTooltipsGadget' ) &&\n\t\t// T243822: Temporarily disabled in the mobile skin\n\t\tconfig.get( 'skin' ) !== 'minerva' );\n}\n","module.exports = \"<svg xmlns=\\\"http://www.w3.org/2000/svg\\\" width=\\\"0\\\" height=\\\"0\\\"><defs><clipPath id=\\\"mwe-popups-mask\\\"><path d=\\\"M0 8h10l8-8 8 8h974v992H0z\\\"></path></clipPath><clipPath id=\\\"mwe-popups-mask-flip\\\"><path d=\\\"M0 8h294l8-8 8 8h690v992H0z\\\"></path></clipPath><clipPath id=\\\"mwe-popups-landscape-mask\\\"><path d=\\\"M0 8h174l8-8 8 8h810v992H0z\\\"></path></clipPath><clipPath id=\\\"mwe-popups-landscape-mask-flip\\\"><path d=\\\"M0 0h1000v242H190l-8 8-8-8H0z\\\"></path></clipPath></defs></svg>\""],"sourceRoot":""}