src/convenientDiscussions.js

/**
 * Module that populates the {@link convenientDiscussions} object.
 *
 * @module convenientDiscussions
 */

import Comment from './Comment';
import cd from './cd';
import controller from './controller';
import debug from './debug';
import pageRegistry from './pageRegistry';
import { buildEditSummary, getQueryParamBooleanValue, underlinesToSpaces } from './utils-general';
import { wrapDiffBody, wrapHtml } from './utils-window';

const mwStringsCache = {};
let isQqxMode;

const serverName = mw.config.get('wgServerName');

// For historical reasons, ru.wikipedia.org has 'cd'.
const localOptionsPrefix = serverName === 'ru.wikipedia.org' ? 'cd' : 'convenientDiscussions';

// For historical reasons, ru.wikipedia.org has 'watchedTopics'.
const subscriptionsOptionNameEnding = serverName === 'ru.wikipedia.org' ?
  'watchedTopics' :
  'watchedSections';

let server = mw.config.get('wgServer');
if (server.startsWith('//')) {
  server = location.protocol + server;
}
const bodyClassList = document.body.classList;

// Some users increase the font size (zoom), which leads to some short distances jumping between 3
// and 4 physical pixels and similar. With the help of pixelDeviationRatio, we can make all widths
// look the same by using a variable that stores deviation from standard values. Also unround device
// pixel ratios (like 1.75) may have the same effect (not sure; need to confirm). We can use a
// formula here of course, but that would be less readable :)
const devicePixelRatioToDivisor = [
  // Thread lines are 4 or more physical pixels, comment markers are 12 or more physical pixels, 4 or more from each side
  [4, 4],

  // Thread lines are 3 physical pixels, comment markers are 11 physical pixels, 4 from each side
  [3.6666666, 3.6666666],

  // Thread lines are 3 physical pixels, comment markers are 9 physical pixels, 3 from each side
  [3, 3],

  // Thread lines are 2 physical pixels, comment markers are 8 physical pixels, 3 from each side
  [2.6666666, 2.6666666],

  // Thread lines are 2 physical pixels, comment markers are 6 physical pixels, 2 from each side
  [2, 2],

  // Thread lines are 1 physical pixel, comment markers are 5 physical pixels, 2 from each side
  [1.6666666, 1.6666666],

  // Thread lines are 1 physical pixel, comment markers are 3 physical pixels, 1 from each side (default)
  [0, 1],
];

const pixelDeviationRatio = devicePixelRatioToDivisor.reduce((value, [dpr, divisor]) => (
  value ||
  (window.devicePixelRatio >= dpr ? window.devicePixelRatio / divisor : value)
), undefined);

Object.assign(cd, {
  /**
   * Get a language string.
   *
   * @param {string} name String name.
   * @param {...*} [params] String parameters (substituted strings, also
   *   {@link module:userRegistry.User User} objects for use in `{{gender:}}`). The last parameter
   *   can be an object that can have a boolean property `parse` (should the message be returned in
   *   a parsed form). In the `parse` form, wikilinks are replaced with HTML tags, the code is
   *   sanitized. Use this for strings that have their raw HTML inserted into the page.
   * @returns {?string}
   * @memberof convenientDiscussions
   */
  s(name, ...params) {
    if (!name) {
      return null;
    }
    const fullName = `convenient-discussions-${name}`;
    let options = {};
    let lastParam = params[params.length - 1];

    // lastParam.options is a mw.user-like object to provide to {{gender:}}
    if (typeof lastParam === 'object' && !lastParam.options) {
      options = lastParam;
      params.splice(params.length - 1);
    }

    isQqxMode ??= /[?&]uselang=qqx(?=&|$)/.test(location.search);
    if (!isQqxMode && mw.messages.get(fullName) !== null) {
      return mw.message(fullName, ...params)[options.parse ? 'parse' : 'text']();
    } else {
      const paramsString = params.length ? `: ${params.join(', ')}` : '';
      return `(${fullName}${paramsString})`;
    }
  },

  /**
   * Get a language string in the "parse" format. Wikilinks are replaced with HTML tags, the code is
   * sanitized. Use this for strings that have their raw HTML inserted into the page.
   *
   * @param {string} name String name.
   * @param {...*} [params] String parameters (substituted strings, also
   *   {@link module:userRegistry.User User} objects for use in `{{gender:}}`).
   * @returns {?string}
   * @memberof convenientDiscussions
   */
  sParse(name, ...params) {
    if (params.some((param) => /[<>]/.test(param))) {
      // mw.message().parse() escapes tags in parameters - work around that.
      mw.messages.set('convenient-discussions-parsehack', cd.s(name, ...params));
      return mw.message('convenient-discussions-parsehack').parse();
    }
    return cd.s(name, ...params, { parse: true });
  },

  /**
   * A foolproof method to access MediaWiki messages intended to be used instead of
   * {@link https://doc.wikimedia.org/mediawiki-core/master/js/mw.html#.msg mw.msg()} to eliminate
   * any possibility of an XSS injection. By programmer's mistake some `mw.msg()` value could be
   * inserted into a page in a raw HTML form. To prevent this, this function should be used, so if
   * the message contains an injection (for example, brought from Translatewiki or inserted by a
   * user who doesn't have the `editsitejs` right but does have the `editinterface` right), the
   * function would sanitize the value.
   *
   * @param {string} name String name.
   * @param {...*} [params] String parameters (substituted strings, also
   *   {@link module:userRegistry.User User} objects for use in {{gender:}}). The last parameter can
   *   be an object that can have a string property `language`. If `language` is `'content'`, the
   *   returned message will be in the content langage (not the interface language).
   * @returns {string}
   * @memberof convenientDiscussions
   */
  mws(name, ...params) {
    let options;
    let lastParam = params[params.length - 1];
    if (typeof lastParam === 'object') {
      options = lastParam;
      params.splice(params.length - 1);
    }
    if (options && options.language === 'content') {
      name = '(content)' + name;
    }
    if (!params.length && mwStringsCache[name]) {
      return mwStringsCache[name];
    }
    let message;
    if (/^(discussiontools|visualeditor)-/.test(name)) {
      message = mw.messages.exists(name) ?
        mw.message(name, ...params).parse() :
        cd.sParse(name.slice(name.indexOf('-') + 1));
    } else {
      message = mw.message(name, ...params).parse();
    }
    if (!params.length && !message.startsWith('⧼')) {
      // Use cache since in some places a message could be requested very frequently. Don't cache
      // missing messages (they can come from dialogs opened with a network error, like
      // UploadDialog; messages can still be accessed for some silly reason).
      mwStringsCache[name] = message;
    }
    return message;
  },

  getApiConfig() {
    return {
      parameters: {
        formatversion: 2,
        uselang: cd.g.userLanguage,
      },
      ajax: {
        headers: {
          'Api-User-Agent': 'c:User:Jack who built the house/Convenient Discussions',
        },
      },
    };
  },

  /**
   * Reference to the {@link module:debug debug} module.
   *
   * @memberof convenientDiscussions
   * @see module:debug
   */
  debug,

  // Kind of a temporary storage of objects of some script's features. Could be removed at any
  // moment.
  tests: { controller },

  /**
   * Script's publicly available API. Here there are some utilities that we believe should be
   * accessible for external use.
   *
   * If you need some internal method to be available publicly, contact the script's maintainer (or
   * just make a relevant pull request).
   *
   * @namespace api
   * @memberof convenientDiscussions
   */
  api: {
    /**
     * If CD isn't loaded (on pages where CD clearly doesn't need to run), only
     * {@link module:pageRegistry.get} and {@link module:pageRegistry.Page#isProbablyTalkPage} are
     * guaranteed to run.
     *
     * @see module:pageRegistry
     * @name pageRegistry
     * @type {object}
     * @memberof convenientDiscussions.api
     */
    pageRegistry,

    /**
     * @see CommentSkeleton.generateId
     * @function generateCommentId
     * @memberof convenientDiscussions.api
     */
    generateCommentId: Comment.generateId.bind(Comment),

    /**
     * @see module:Comment.parseId
     * @function parseCommentId
     * @memberof convenientDiscussions.api
     */
    parseCommentId: Comment.parseId.bind(Comment),

    /**
     * @see module:util.buildEditSummary
     * @function buildEditSummary
     * @memberof convenientDiscussions.api
     */
    buildEditSummary,

    /**
     * @see module:controller.isPageOverlayOn
     * @function isPageOverlayOn
     * @memberof convenientDiscussions.api
     */
    isPageOverlayOn: controller.isPageOverlayOn.bind(controller),

    /**
     * @see module:util.wrapHtml
     * @function wrapHtml
     * @memberof convenientDiscussions.api
     */
    wrapHtml,

    // TODO: Remove after wiki configurations are updated.
    wrap: wrapHtml,

    /**
     * @see module:util.wrapDiffBody
     * @function wrapDiffBody
     * @memberof convenientDiscussions.api
     */
    wrapDiffBody,
  },

  /**
   * Is the code running in the worker context.
   *
   * @name isWorker
   * @type {boolean}
   * @memberof convenientDiscussions
   */
  isWorker: false,
});

/**
 * Collection of properties accessible from anywhere in the script that are not grouped in any other
 * way. This is an incomplete list. "g" is for "global".
 *
 * @namespace g
 * @memberof convenientDiscussions
 */
Object.assign(cd.g, {
  // These are properties known from the beginning. We assume that there is no point to make them
  // subject to change by site administrators although this may be disputable. Some of them are
  // extensible in the configuration file (such as noHighlightClasses).

  debug: getQueryParamBooleanValue('cddebug') ?? Boolean(IS_DEV),

  /**
   * A replacement for
   * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Unicode_Property_Escapes unicode property escapes}
   * while they are not supported in major browsers. {@link https://github.com/slevithan/xregexp}
   * can be used also.
   *
   * @type {string}
   * @memberof convenientDiscussions.g
   */
  letterPattern: 'A-Za-z\\u00aa\\u00b5\\u00ba\\u00c0-\\u00d6\\u00d8-\\u00f6\\u00f8-\\u02c1\\u02c6-\\u02d1\\u02e0-\\u02e4\\u02ec\\u02ee\\u0370-\\u0374\\u0376\\u0377\\u037a-\\u037d\\u037f\\u0386\\u0388-\\u038a\\u038c\\u038e-\\u03a1\\u03a3-\\u03f5\\u03f7-\\u0481\\u048a-\\u052f\\u0531-\\u0556\\u0559\\u0561-\\u0587\\u05d0-\\u05ea\\u05f0-\\u05f2\\u0620-\\u064a\\u066e\\u066f\\u0671-\\u06d3\\u06d5\\u06e5\\u06e6\\u06ee\\u06ef\\u06fa-\\u06fc\\u06ff\\u0710\\u0712-\\u072f\\u074d-\\u07a5\\u07b1\\u07ca-\\u07ea\\u07f4\\u07f5\\u07fa\\u0800-\\u0815\\u081a\\u0824\\u0828\\u0840-\\u0858\\u08a0-\\u08b4\\u0904-\\u0939\\u093d\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098c\\u098f\\u0990\\u0993-\\u09a8\\u09aa-\\u09b0\\u09b2\\u09b6-\\u09b9\\u09bd\\u09ce\\u09dc\\u09dd\\u09df-\\u09e1\\u09f0\\u09f1\\u0a05-\\u0a0a\\u0a0f\\u0a10\\u0a13-\\u0a28\\u0a2a-\\u0a30\\u0a32\\u0a33\\u0a35\\u0a36\\u0a38\\u0a39\\u0a59-\\u0a5c\\u0a5e\\u0a72-\\u0a74\\u0a85-\\u0a8d\\u0a8f-\\u0a91\\u0a93-\\u0aa8\\u0aaa-\\u0ab0\\u0ab2\\u0ab3\\u0ab5-\\u0ab9\\u0abd\\u0ad0\\u0ae0\\u0ae1\\u0af9\\u0b05-\\u0b0c\\u0b0f\\u0b10\\u0b13-\\u0b28\\u0b2a-\\u0b30\\u0b32\\u0b33\\u0b35-\\u0b39\\u0b3d\\u0b5c\\u0b5d\\u0b5f-\\u0b61\\u0b71\\u0b83\\u0b85-\\u0b8a\\u0b8e-\\u0b90\\u0b92-\\u0b95\\u0b99\\u0b9a\\u0b9c\\u0b9e\\u0b9f\\u0ba3\\u0ba4\\u0ba8-\\u0baa\\u0bae-\\u0bb9\\u0bd0\\u0c05-\\u0c0c\\u0c0e-\\u0c10\\u0c12-\\u0c28\\u0c2a-\\u0c39\\u0c3d\\u0c58-\\u0c5a\\u0c60\\u0c61\\u0c85-\\u0c8c\\u0c8e-\\u0c90\\u0c92-\\u0ca8\\u0caa-\\u0cb3\\u0cb5-\\u0cb9\\u0cbd\\u0cde\\u0ce0\\u0ce1\\u0cf1\\u0cf2\\u0d05-\\u0d0c\\u0d0e-\\u0d10\\u0d12-\\u0d3a\\u0d3d\\u0d4e\\u0d5f-\\u0d61\\u0d7a-\\u0d7f\\u0d85-\\u0d96\\u0d9a-\\u0db1\\u0db3-\\u0dbb\\u0dbd\\u0dc0-\\u0dc6\\u0e01-\\u0e30\\u0e32\\u0e33\\u0e40-\\u0e46\\u0e81\\u0e82\\u0e84\\u0e87\\u0e88\\u0e8a\\u0e8d\\u0e94-\\u0e97\\u0e99-\\u0e9f\\u0ea1-\\u0ea3\\u0ea5\\u0ea7\\u0eaa\\u0eab\\u0ead-\\u0eb0\\u0eb2\\u0eb3\\u0ebd\\u0ec0-\\u0ec4\\u0ec6\\u0edc-\\u0edf\\u0f00\\u0f40-\\u0f47\\u0f49-\\u0f6c\\u0f88-\\u0f8c\\u1000-\\u102a\\u103f\\u1050-\\u1055\\u105a-\\u105d\\u1061\\u1065\\u1066\\u106e-\\u1070\\u1075-\\u1081\\u108e\\u10a0-\\u10c5\\u10c7\\u10cd\\u10d0-\\u10fa\\u10fc-\\u1248\\u124a-\\u124d\\u1250-\\u1256\\u1258\\u125a-\\u125d\\u1260-\\u1288\\u128a-\\u128d\\u1290-\\u12b0\\u12b2-\\u12b5\\u12b8-\\u12be\\u12c0\\u12c2-\\u12c5\\u12c8-\\u12d6\\u12d8-\\u1310\\u1312-\\u1315\\u1318-\\u135a\\u1380-\\u138f\\u13a0-\\u13f5\\u13f8-\\u13fd\\u1401-\\u166c\\u166f-\\u167f\\u1681-\\u169a\\u16a0-\\u16ea\\u16f1-\\u16f8\\u1700-\\u170c\\u170e-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176c\\u176e-\\u1770\\u1780-\\u17b3\\u17d7\\u17dc\\u1820-\\u1877\\u1880-\\u18a8\\u18aa\\u18b0-\\u18f5\\u1900-\\u191e\\u1950-\\u196d\\u1970-\\u1974\\u1980-\\u19ab\\u19b0-\\u19c9\\u1a00-\\u1a16\\u1a20-\\u1a54\\u1aa7\\u1b05-\\u1b33\\u1b45-\\u1b4b\\u1b83-\\u1ba0\\u1bae\\u1baf\\u1bba-\\u1be5\\u1c00-\\u1c23\\u1c4d-\\u1c4f\\u1c5a-\\u1c7d\\u1ce9-\\u1cec\\u1cee-\\u1cf1\\u1cf5\\u1cf6\\u1d00-\\u1dbf\\u1e00-\\u1f15\\u1f18-\\u1f1d\\u1f20-\\u1f45\\u1f48-\\u1f4d\\u1f50-\\u1f57\\u1f59\\u1f5b\\u1f5d\\u1f5f-\\u1f7d\\u1f80-\\u1fb4\\u1fb6-\\u1fbc\\u1fbe\\u1fc2-\\u1fc4\\u1fc6-\\u1fcc\\u1fd0-\\u1fd3\\u1fd6-\\u1fdb\\u1fe0-\\u1fec\\u1ff2-\\u1ff4\\u1ff6-\\u1ffc\\u2071\\u207f\\u2090-\\u209c\\u2102\\u2107\\u210a-\\u2113\\u2115\\u2119-\\u211d\\u2124\\u2126\\u2128\\u212a-\\u212d\\u212f-\\u2139\\u213c-\\u213f\\u2145-\\u2149\\u214e\\u2183\\u2184\\u2c00-\\u2c2e\\u2c30-\\u2c5e\\u2c60-\\u2ce4\\u2ceb-\\u2cee\\u2cf2\\u2cf3\\u2d00-\\u2d25\\u2d27\\u2d2d\\u2d30-\\u2d67\\u2d6f\\u2d80-\\u2d96\\u2da0-\\u2da6\\u2da8-\\u2dae\\u2db0-\\u2db6\\u2db8-\\u2dbe\\u2dc0-\\u2dc6\\u2dc8-\\u2dce\\u2dd0-\\u2dd6\\u2dd8-\\u2dde\\u2e2f\\u3005\\u3006\\u3031-\\u3035\\u303b\\u303c\\u3041-\\u3096\\u309d-\\u309f\\u30a1-\\u30fa\\u30fc-\\u30ff\\u3105-\\u312d\\u3131-\\u318e\\u31a0-\\u31ba\\u31f0-\\u31ff\\u3400-\\u4db5\\u4e00-\\u9fd5\\ua000-\\ua48c\\ua4d0-\\ua4fd\\ua500-\\ua60c\\ua610-\\ua61f\\ua62a\\ua62b\\ua640-\\ua66e\\ua67f-\\ua69d\\ua6a0-\\ua6e5\\ua717-\\ua71f\\ua722-\\ua788\\ua78b-\\ua7ad\\ua7b0-\\ua7b7\\ua7f7-\\ua801\\ua803-\\ua805\\ua807-\\ua80a\\ua80c-\\ua822\\ua840-\\ua873\\ua882-\\ua8b3\\ua8f2-\\ua8f7\\ua8fb\\ua8fd\\ua90a-\\ua925\\ua930-\\ua946\\ua960-\\ua97c\\ua984-\\ua9b2\\ua9cf\\ua9e0-\\ua9e4\\ua9e6-\\ua9ef\\ua9fa-\\ua9fe\\uaa00-\\uaa28\\uaa40-\\uaa42\\uaa44-\\uaa4b\\uaa60-\\uaa76\\uaa7a\\uaa7e-\\uaaaf\\uaab1\\uaab5\\uaab6\\uaab9-\\uaabd\\uaac0\\uaac2\\uaadb-\\uaadd\\uaae0-\\uaaea\\uaaf2-\\uaaf4\\uab01-\\uab06\\uab09-\\uab0e\\uab11-\\uab16\\uab20-\\uab26\\uab28-\\uab2e\\uab30-\\uab5a\\uab5c-\\uab65\\uab70-\\uabe2\\uac00-\\ud7a3\\ud7b0-\\ud7c6\\ud7cb-\\ud7fb\\uf900-\\ufa6d\\ufa70-\\ufad9\\ufb00-\\ufb06\\ufb13-\\ufb17\\ufb1d\\ufb1f-\\ufb28\\ufb2a-\\ufb36\\ufb38-\\ufb3c\\ufb3e\\ufb40\\ufb41\\ufb43\\ufb44\\ufb46-\\ufbb1\\ufbd3-\\ufd3d\\ufd50-\\ufd8f\\ufd92-\\ufdc7\\ufdf0-\\ufdfb\\ufe70-\\ufe74\\ufe76-\\ufefc\\uff21-\\uff3a\\uff41-\\uff5a\\uff66-\\uffbe\\uffc2-\\uffc7\\uffca-\\uffcf\\uffd2-\\uffd7\\uffda-\\uffdc',

  /**
   * Left and right margins of comment layers used as a fallback (when a comment is placed
   * somewhere where we don't know how to position the layers).
   *
   * @type {number}
   * @memberof convenientDiscussions.g
   */
  commentFallbackSideMargin: 10,

  /**
   * Left and right padding of thread lines.
   *
   * @type {number}
   * @memberof convenientDiscussions.g
   */
  threadLineSidePadding: 3,

  /**
   * Width (thickness) of comment markers and thread lines when you hover over them. Should be an
   * odd number - otherwise the browser will render 1 pixel more on one side, and for each comment
   * differently. See also pixelDeviationRatio that helps achieve this evenness.
   *
   * @type {number}
   * @memberof convenientDiscussions.g
   */
  commentMarkerWidth: 3,

  pixelDeviationRatio,

  pixelDeviationRatioFor1px: (
    window.devicePixelRatio / Math.max(Math.floor(window.devicePixelRatio), 1)
  ),

  /**
   * Number of seconds between checks for new comments when the tab is not hidden.
   *
   * @type {number}
   * @memberof convenientDiscussions.g
   */
  updateCheckInterval: 15,

  /**
   * Number of seconds between new comments checks when the tab is hidden.
   *
   * @type {number}
   * @memberof convenientDiscussions.g
   */
  backgroundUpdateCheckInterval: 60,

  /**
   * Number of milliseconds in a minute.
   *
   * @type {number}
   * @memberof convenientDiscussions.g
   */
  msInMin: 1000 * 60,

  /**
   * Number of milliseconds in a day.
   *
   * @type {number}
   * @memberof convenientDiscussions.g
   */
  msInDay: 1000 * 60 * 60 * 24,

  /**
   * Popular elements that can be met in page content and don't have the `display: inline` property
   * in the default browser styles.
   *
   * @type {string[]}
   * @memberof convenientDiscussions.g
   */
  popularNotInlineElements: ['BLOCKQUOTE', 'CAPTION', 'CENTER', 'DD', 'DIV', 'DL', 'DT', 'FIGURE', 'FIGCAPTION', 'FORM', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'HR', 'INPUT', 'LI', 'LINK', 'OL', 'P', 'PRE', 'SECTION', 'STYLE', 'TABLE', 'TBODY', 'TD', 'TFOOT', 'TH', 'THEAD', 'TR', 'UL'],

  /**
   * Popular elements that can be met in page content and do have the `display: inline` property in
   * the default browser styles.
   *
   * @type {string[]}
   * @memberof convenientDiscussions.g
   */
  popularInlineElements: ['A', 'ABBR', 'B', 'BDI', 'BIG', 'BR', 'BUTTON', 'CITE', 'CODE', 'DEL', 'EM', 'FONT', 'I', 'IMG', 'INS', 'KBD', 'META', 'Q', 'S', 'SAMP', 'SMALL', 'SPAN', 'STRIKE', 'STRONG', 'SUB', 'SUP', 'TIME', 'TT', 'U', 'VAR'],

  /**
   * Elements with classes listed here won't be considered legit comment timestamp containers. They
   * can still be parts of comments; for the way to prevent certain elements from becoming comment
   * parts, see {@link module:defaultConfig.rejectNode}. This value can have a wikitext counterpart
   * (though not necessarily), {@link module:defaultConfig.noSignatureTemplates}, for classes that
   * are specified inside templates.
   *
   * When it comes to the wikitext, all lines containing these classes are ignored.
   *
   * @type {string[]}
   * @default []
   * @memberof convenientDiscussions.g
   */
  noSignatureClasses: ['mw-notalk', 'cd-moveMark'],

  /**
   * Names of elements that shouldn't be the first or last highlightable element. CD wraps these
   * elements into `<div>` containers. It allows for comment headers to be displayed correctly when
   * the `reformatComments` setting is enabled.
   *
   * @type {string[]}
   * @memberof convenientDiscussions.g
   */
  badHighlightableElements: ['BLOCKQUOTE', 'DL', 'FORM', 'HR', 'OL', 'PRE', 'TABLE', 'UL'],

  /**
   * Classes of elements that shouldn't be highlighted. Only MediaWiki-assigned and native CD
   * classes go here. Wiki-specific classes go in the configuration.
   *
   * @type {string[]}
   * @memberof convenientDiscussions.g
   */
  noHighlightClasses: [
    'mw-empty-elt',
    'tleft',
    'tright',
    'floatleft',
    'floatright',
    'cd-moveMark',
    'cd-noHighlight',
  ],

  /**
   * Regexps for strings that should be cut out of comment beginnings (not considered parts of
   * comments) when editing comments.
   *
   * @type {RegExp[]}
   * @memberof convenientDiscussions.g
   */
  badCommentBeginnings: [
    /^<!--[^]*?--> *\n+/,
    /^(?:----+|<hr>) *\n+/i,
    /^\{\|.*?\|\} *\n+(?=[*:#])/,
  ],

  /**
   * Auxiliary property to keep the sign code: `'\~\~\~\~'`. If written as plain text, it gets
   * transformed into the revision author's signature when saved. Note that the minifier
   * translates `'~\~\\~'` and `'\~\~' + '\~'` into `'\~\~\~'`.
   *
   * @type {string}
   * @memberof convenientDiscussions.g
   */
  signCode: '~~'.concat('~~'),

  /**
   * List of tags allowed in user input. See
   * {@link https://www.mediawiki.org/wiki/Help:HTML_in_wikitext#Allowed_HTML_tags},
   * {@link https://en.wikipedia.org/wiki/Help:HTML_in_wikitext#Parser_and_extension_tags}.
   * Deprecated tags are not included.
   *
   * @type {string[]}
   * @memberof convenientDiscussions.g
   */
  allowedTags: [
    'abbr',
    'b',
    'bdi',
    'bdo',
    'blockquote',
    'br',
    'caption',
    'cite',
    'code',
    'data',
    'dd',
    'del',
    'dfn',
    'div',
    'dl',
    'dt',
    'em',
    'h1',
    'h2',
    'h3',
    'h4',
    'h5',
    'h6',
    'hr',
    'i',
    'ins',
    'kbd',
    'li',
    'link',
    'mark',
    'meta',
    'ol',
    'p',
    'pre',
    'q',
    'rp',
    'rt',
    'rtc',
    'ruby',
    's',
    'samp',
    'small',
    'span',
    'strong',
    'sub',
    'sup',
    'table',
    'td',
    'th',
    'time',
    'tr',
    'translate',
    'tvar',
    'u',
    'ul',
    'var',
    'wbr',
    'gallery',
    'includeonly',
    'noinclude',
    'nowiki',
    'onlyinclude',
    'categorytree',
    'charinsert',
    'chem',
    'ce',
    'graph',
    'hiero',
    'imagemap',
    'indicator',
    'inputbox',
    'mapframe',
    'maplink',
    'math',
    'poem',
    'ref',
    'references',
    'score',
    'section',
    'syntaxhighlight',
    'templatedata',
    'templatestyles',
    'timeline',
  ],

  inputPropsAffectingCoords: [
    'borderBottomStyle',
    'borderBottomWidth',
    'borderLeftStyle',
    'borderLeftWidth',
    'borderRightStyle',
    'borderRightWidth',
    'borderTopStyle',
    'borderTopWidth',
    'boxSizing',
    'direction',
    'fontFamily',
    'fontSize',
    'fontSizeAdjust',
    'fontStretch',
    'fontStyle',
    'fontVariant',
    'fontWeight',
    'height',
    'letterSpacing',
    'lineHeight',
    'overflowX',
    'overflowY',
    'paddingBottom',
    'paddingLeft',
    'paddingRight',
    'paddingTop',
    'tabSize',
    'textAlign',
    'textDecoration',
    'textIndent',
    'textTransform',
    'width',
    'wordSpacing',
  ],

  settingsOptionName: 'userjs-convenientDiscussions-settings',
  localSettingsOptionName: `userjs-${localOptionsPrefix}-localSettings`,
  visitsOptionName: `userjs-${localOptionsPrefix}-visits`,
  subscriptionsOptionName: `userjs-${localOptionsPrefix}-${subscriptionsOptionNameEnding}`,
  server,
  serverName,
  pageName: underlinesToSpaces(mw.config.get('wgPageName')),
  pageTitle: mw.config.get('wgTitle'),
  namespaceNumber: mw.config.get('wgNamespaceNumber'),
  pageAction: mw.config.get('wgAction'),

  // Check for mw.user.isNamed() to treat temporary accounts as unregistered (we can't save
  // options for them anyway). `<unregistered>` is a workaround for anonymous users (there are
  // such!).
  userName: (
    ((!mw.user.isNamed || mw.user.isNamed()) && mw.config.get('wgUserName')) ||
    '<unregistered>'
  ),

  contentDirection: bodyClassList.contains('sitedir-rtl') ? 'rtl' : 'ltr',
  userDirection: bodyClassList.contains('rtl') ? 'rtl' : 'ltr',
  skin: mw.config.get('skin'),

  // Quite a rough check for mobile browsers, a mix of what is advised at
  // https://stackoverflow.com/a/24600597 (sends to
  // https://developer.mozilla.org/en-US/docs/Browser_detection_using_the_user_agent) and
  // https://stackoverflow.com/a/14301832.
  isMobile: (
    /Mobi|Android/i.test(navigator.userAgent) ||
    typeof window.orientation !== 'undefined'
  ),

  isDtReplyToolEnabled: bodyClassList.contains('ext-discussiontools-replytool-enabled'),
  isDtNewTopicToolEnabled: bodyClassList.contains('ext-discussiontools-newtopictool-enabled'),
  isDtTopicSubscriptionEnabled: bodyClassList
    .contains('ext-discussiontools-topicsubscription-enabled'),
  isDtVisualEnhancementsEnabled: bodyClassList
    .contains('ext-discussiontools-visualenhancements-enabled'),

  isParsoidUsed: $('#mw-content-text > .mw-parser-output')
    .contents()
    .get()
    .filter((node) => node.nodeType === Node.COMMENT_NODE)
    .some((c) => c.textContent.startsWith('Parsoid')),
});

if (cd.g.debug) {
  window.cd = cd;
}