☰

Mouseover Popup Image Viewer

Shows images and videos behind links and thumbnails.

目前为 2020-02-26 提交的版本。查看 最新版本。

  1. // ==UserScript==
  2. // @name        Mouseover Popup Image Viewer
  3. // @namespace   https://github.com/tophf
  4. // @description Shows images and videos behind links and thumbnails.
  5.  
  6. // @include     http*
  7. // @connect     *
  8.  
  9. // allow rule installer in config dialog https://w9p.co/userscripts/mpiv/more_host_rules.html
  10. // @connect     w9p.co
  11.  
  12. // @grant       GM_getValue
  13. // @grant       GM_setValue
  14. // @grant       GM_xmlhttpRequest
  15. // @grant       GM_openInTab
  16. // @grant       GM_registerMenuCommand
  17.  
  18. // @version     1.0.18
  19. // @author      tophf
  20.  
  21. // @original-version 2017.9.29
  22. // @original-author  kuehlschrank
  23.  
  24. // @supportURL  https://github.com/tophf/mpiv/issues
  25. // @homepage    https://w9p.co/userscripts/mpiv/
  26. // @icon        https://w9p.co/userscripts/mpiv/icon.png
  27. // ==/UserScript==
  28.  
  29. 'use strict';
  30.  
  31. const doc = document;
  32. const hostname = location.hostname;
  33. const dotDomain = '.' + hostname;
  34. const installableSites = ['greasyfork.org', 'w9p.co', 'github.com'];
  35. const isGoogleDomain = /(^|\.)google(\.com?)?(\.\w+)?$/.test(hostname);
  36. const isGoogleImages = isGoogleDomain && /[&?]tbm=isch(&|$)/.test(location.search);
  37.  
  38. const POSTMSG_PREFIX = GM_info.script.name + ':';
  39. const PREFIX = 'mpiv-';
  40. const STATUS_ATTR = `${PREFIX}status`;
  41. const WHEEL_EVENT = 'onwheel' in doc ? 'wheel' : 'mousewheel';
  42. const PASSIVE = {passive: true};
  43. // time for volatile things to settle down meanwhile we postpone action
  44. // examples: loading image from cache, quickly moving mouse over one element to another
  45. const SETTLE_TIME = 50;
  46. // used to detect JS code in host rules
  47. const RX_HAS_CODE = /(^|[^-\w])return[\W\s]/;
  48.  
  49. /** @type mpiv.Config */
  50. let cfg;
  51. /** @type mpiv.AppInfo */
  52. let ai = {rule: {}};
  53.  
  54. const clamp = (v, min, max) => v < min ? min : v > max ? max : v;
  55. const ensureArray = v => Array.isArray(v) ? v : [v];
  56. const safeIncludes = (a, b) => typeof a === 'string' && a.includes(b);
  57. const sumProps = (...props) => props.reduce((sum, v) => sum + (parseFloat(v) || 0), 0);
  58. const tryCatch = function (fn, ...args) {
  59.   try {
  60.     return fn.apply(this, args);
  61.   } catch (e) {}
  62. };
  63. const $ = (s, n = doc) => n.querySelector(s) || 0;
  64. const $$ = (s, n = doc) => n.querySelectorAll(s);
  65. const $create = (tag, props) => Object.assign(document.createElement(tag), props);
  66. const $many = (q, doc) => q && ensureArray(q).reduce((el, sel) => el || $(sel, doc), null);
  67. const $prop = (s, prop, n = doc) => (n.querySelector(s) || 0)[prop] || '';
  68. const $propUp = (n, prop) => (n = n.closest(`[${prop}]`)) &&
  69.                              (prop.startsWith('data-') ? n.getAttribute(prop) : n[prop]) || '';
  70. const dropEvent = e => (e.preventDefault(), e.stopPropagation());
  71.  
  72. class App {
  73.  
  74.   static init() {
  75.     /** @type mpiv.Config */
  76.     Config.DEFAULTS = Object.assign(Object.create(null), {
  77.       center: false,
  78.       css: '',
  79.       delay: 500,
  80.       globalStatus: false,
  81.       // prefer ' inside rules because " will be displayed as \"
  82.       // example: "img[src*='icon']"
  83.       hosts: [{
  84.         name: 'No popup for YouTube thumbnails',
  85.         d: 'www.youtube.com',
  86.         e: 'ytd-rich-item-renderer *, ytd-thumbnail *',
  87.         s: '',
  88.       }, {
  89.         name: 'No popup for SVG/PNG icons',
  90.         d: '',
  91.         e: "img[src*='icon']",
  92.         r: '//[^/]+/.*\\bicons?\\b.*\\.(?:png|svg)',
  93.         s: '',
  94.       }],
  95.       imgtab: false,
  96.       preload: false,
  97.       scale: 1.25,
  98.       scales: ['0!', 0.125, 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 5, 8, 16],
  99.       start: 'auto',
  100.       version: 6,
  101.       xhr: true,
  102.       zoom: 'context',
  103.       zoomOut: 'auto',
  104.     });
  105.     cfg = new Config({save: true});
  106.     App.isImageTab = doc.images.length === 1 &&
  107.                      doc.images[0].parentNode === doc.body &&
  108.                      !doc.links.length;
  109.     App.enabled = cfg.imgtab || !App.isImageTab;
  110.  
  111.     GM_registerMenuCommand('MPIV: configure', setup);
  112.     doc.addEventListener('mouseover', Events.onMouseOver, PASSIVE);
  113.  
  114.     if (isGoogleDomain && doc.getElementById('main'))
  115.       doc.getElementById('main').addEventListener('mouseover', Events.onMouseOver, PASSIVE);
  116.  
  117.     if (installableSites.includes(hostname)) {
  118.       doc.addEventListener('click', e => {
  119.         if (hostname === 'github.com' && !location.pathname.startsWith('/tophf/mpiv/')) return;
  120.         const el = e.target.closest('blockquote, code, pre');
  121.         const text = el && el.textContent.trim();
  122.         let rule;
  123.         if (text && e.button === 0 &&
  124.             /^\s*{\s*"\w+"\s*:[\s\S]+}\s*$/.test(text) &&
  125.             (rule = tryCatch(JSON.parse, text))) {
  126.           setup({rule});
  127.           dropEvent(e);
  128.         }
  129.       });
  130.     }
  131.  
  132.     window.addEventListener('message', App.onMessageParent);
  133.   }
  134.  
  135.   /** @param {MessageEvent} e */
  136.   static onMessageParent(e) {
  137.     if (typeof e.data === 'string' && e.data.startsWith(POSTMSG_PREFIX)) {
  138.       for (const el of $$('iframe, frame')) {
  139.         if (el.contentWindow === e.source) {
  140.           const r = el.getBoundingClientRect();
  141.           const w = clamp(r.width, 0, innerWidth - r.left);
  142.           const h = clamp(r.height, 0, innerHeight - r.top);
  143.           e.source.postMessage(`${POSTMSG_PREFIX}${w}:${h}`, '*');
  144.         }
  145.       }
  146.     }
  147.   }
  148.  
  149.   /** @param {MessageEvent} e */
  150.   static onMessageChild(e) {
  151.     if (e.source === parent && typeof e.data === 'string' && e.data.startsWith(POSTMSG_PREFIX)) {
  152.       const [width, height] = e.data.slice(POSTMSG_PREFIX.length).split(':').map(parseFloat);
  153.       if (width && height) {
  154.         ai.view = {width, height};
  155.         window.removeEventListener('message', App.onMessageChild);
  156.       }
  157.     }
  158.   }
  159.  
  160.   static activate(info, event) {
  161.     const force = event.ctrlKey;
  162.     if (!force) {
  163.       const scale = Util.findScale(info.url, info.node.parentNode);
  164.       if (scale && scale < cfg.scale)
  165.         return;
  166.     }
  167.     if (ai.node)
  168.       App.deactivate();
  169.     ai = info;
  170.     const view = doc.compatMode === 'BackCompat' ? doc.body : doc.documentElement;
  171.     ai.view = {
  172.       width: view.clientWidth,
  173.       height: view.clientHeight,
  174.     };
  175.     if (window !== top) {
  176.       window.addEventListener('message', App.onMessageChild);
  177.       parent.postMessage(POSTMSG_PREFIX + 'getDimensions', '*');
  178.     }
  179.     ai.zooming = cfg.css.includes(`${PREFIX}zooming`);
  180.     Util.suppressHoverTooltip();
  181.     App.setListeners();
  182.     App.updateMouse(event);
  183.     if (force) {
  184.       Popup.start();
  185.     } else if (cfg.start === 'auto' && !ai.rule.manual) {
  186.       Popup.schedule();
  187.     } else {
  188.       App.setStatus('ready');
  189.     }
  190.   }
  191.  
  192.   static checkProgress({start} = {}) {
  193.     const p = ai.popup;
  194.     if (p) {
  195.       ai.nheight = p.naturalHeight || p.videoHeight || ai.popupLoaded && 800;
  196.       ai.nwidth = p.naturalWidth || p.videoWidth || ai.popupLoaded && 1200;
  197.       if (ai.nheight)
  198.         return App.updateProgress();
  199.     }
  200.     if (start)
  201.       ai.timerProgress = setInterval(App.checkProgress, 150);
  202.   }
  203.  
  204.   static deactivate({wait} = {}) {
  205.     App.stopTimers();
  206.     if (ai.req)
  207.       tryCatch.call(ai.req, ai.req.abort);
  208.     if (ai.tooltip)
  209.       ai.tooltip.node.title = ai.tooltip.text;
  210.     App.setStatus(false);
  211.     App.setBar(false);
  212.     App.setListeners(false);
  213.     Popup.destroy();
  214.     if (wait) {
  215.       App.enabled = false;
  216.       setTimeout(App.enable, 200);
  217.     }
  218.     ai = {rule: {}};
  219.   }
  220.  
  221.   static enable() {
  222.     App.enabled = true;
  223.   }
  224.  
  225.   static handleError(e, rule = ai.rule) {
  226.     const fe = Util.formatError(e, rule);
  227.     if (!rule || !ai.urls || !ai.urls.length)
  228.       console.warn(fe.consoleFormat, ...fe.consoleArgs);
  229.     if (cfg.xhr && !ai.xhr && isGoogleImages) {
  230.       ai.xhr = true;
  231.       Popup.startSingle();
  232.     } else if (ai.urls && ai.urls.length) {
  233.       ai.url = ai.urls.shift();
  234.       if (ai.url) {
  235.         App.stopTimers();
  236.         Popup.startSingle();
  237.       } else {
  238.         App.deactivate();
  239.       }
  240.     } else if (ai.node) {
  241.       App.setStatus('error');
  242.       App.setBar(fe.message, 'error');
  243.     }
  244.   }
  245.  
  246.   static setBar(label, className) {
  247.     let b = ai.bar;
  248.     if (typeof label !== 'string') {
  249.       b && b.remove();
  250.       ai.bar = null;
  251.       return;
  252.     }
  253.     if (!b)
  254.       b = ai.bar = $create('div', {id: `${PREFIX}bar`});
  255.     App.updateStyles();
  256.     App.updateTitle();
  257.     App.updateBar();
  258.     b.innerHTML = label;
  259.     if (!b.parentNode) {
  260.       doc.body.appendChild(b);
  261.       Util.forceLayout(b);
  262.     }
  263.     b.className = `${PREFIX}show ${PREFIX}${className}`;
  264.   }
  265.  
  266.   static setListeners(enable = true) {
  267.     const onOff = enable ? doc.addEventListener : doc.removeEventListener;
  268.     const passive = enable ? PASSIVE : undefined;
  269.     onOff.call(doc, 'mousemove', Events.onMouseMove, passive);
  270.     onOff.call(doc, 'mouseout', Events.onMouseOut, passive);
  271.     onOff.call(doc, 'mousedown', Events.onMouseDown, passive);
  272.     onOff.call(doc, 'contextmenu', Events.onContext);
  273.     onOff.call(doc, 'keydown', Events.onKeyDown);
  274.     onOff.call(doc, 'keyup', Events.onKeyUp);
  275.     onOff.call(doc, WHEEL_EVENT, Events.onMouseScroll, enable ? {passive: false} : undefined);
  276.   }
  277.  
  278.   static setStatus(status) {
  279.     if (!status && !cfg.globalStatus)
  280.       return ai.node && ai.node.removeAttribute(STATUS_ATTR);
  281.     const prefix = cfg.globalStatus ? PREFIX : '';
  282.     const action = status && /^[+-]/.test(status) && status[0];
  283.     const name = status && `${prefix}${action ? status.slice(1) : status}`;
  284.     const el = cfg.globalStatus ? doc.documentElement :
  285.       name === 'edge' ? ai.popup :
  286.         ai.node;
  287.     if (!el)
  288.       return;
  289.     const attr = cfg.globalStatus ? 'class' : STATUS_ATTR;
  290.     const oldValue = (el.getAttribute(attr) || '').trim();
  291.     const cls = new Set(oldValue ? oldValue.split(/\s+/) : []);
  292.     switch (action) {
  293.       case '-':
  294.         cls.delete(name);
  295.         break;
  296.       case false:
  297.         for (const c of cls)
  298.           if (c.startsWith(prefix) && c !== name)
  299.             cls.delete(c);
  300.         // fallthrough to +
  301.       case '+':
  302.         if (name)
  303.           cls.add(name);
  304.         break;
  305.     }
  306.     const newValue = [...cls].join(' ');
  307.     if (newValue !== oldValue)
  308.       el.setAttribute(attr, newValue);
  309.   }
  310.  
  311.   static setStatusLoading(force) {
  312.     if (!force) {
  313.       clearTimeout(ai.timerStatus);
  314.       ai.timerStatus = setTimeout(App.setStatusLoading, SETTLE_TIME, true);
  315.     } else if (!ai.popupLoaded) {
  316.       App.setStatus('+loading');
  317.     }
  318.   }
  319.  
  320.   static stopTimers() {
  321.     clearTimeout(ai.timer);
  322.     clearTimeout(ai.timerStatus);
  323.     clearInterval(ai.timerProgress);
  324.   }
  325.  
  326.   static toggleZoom() {
  327.     const p = ai.popup;
  328.     if (!p || !ai.scales || ai.scales.length < 2)
  329.       return;
  330.     ai.zoom = !ai.zoom;
  331.     ai.zoomed = true;
  332.     const z = ai.scales.indexOf(ai.zscale);
  333.     ai.scale = ai.scales[ai.zoom ? (z > 0 ? z : 1) : 0];
  334.     if (ai.zooming)
  335.       p.classList.add(`${PREFIX}zooming`);
  336.     Popup.move();
  337.     App.updateTitle();
  338.     App.setStatus(ai.zoom ? 'zoom' : false);
  339.     if (!ai.zoom)
  340.       App.updateFileInfo();
  341.     return ai.zoom;
  342.   }
  343.  
  344.   static updateBar() {
  345.     if (ai.timerBar)
  346.       return;
  347.     clearTimeout(ai.timerBar);
  348.     ai.bar.style.removeProperty('opacity');
  349.     ai.timerBar = setTimeout(() => {
  350.       ai.timerBar = 0;
  351.       if (ai.bar)
  352.         ai.bar.style.setProperty('opacity', 0);
  353.     }, 3000);
  354.   }
  355.  
  356.   static updateCaption(text, doc = document) {
  357.     switch (typeof ai.rule.c) {
  358.       case 'function':
  359.         // not specifying as a parameter's default value to get the html only when needed
  360.         if (text === undefined)
  361.           text = doc.documentElement.outerHTML;
  362.         ai.caption = ai.rule.c(text, doc, ai.node, ai.rule);
  363.         break;
  364.       case 'string': {
  365.         const el = $many(ai.rule.c, doc);
  366.         ai.caption = !el ? '' :
  367.           el.getAttribute('content') ||
  368.           el.getAttribute('title') ||
  369.           el.textContent;
  370.         break;
  371.       }
  372.       default:
  373.         ai.caption = (ai.tooltip || 0).text || ai.node.alt || $propUp(ai.node, 'title') ||
  374.                      Remoting.getFileName(ai.node.src || $propUp(ai.node, 'href'));
  375.     }
  376.   }
  377.  
  378.   static updateFileInfo() {
  379.     const gi = ai.gItems;
  380.     if (gi) {
  381.       const item = gi[ai.gIndex];
  382.       let c = gi.length > 1 ? '[' + (ai.gIndex + 1) + '/' + gi.length + '] ' : '';
  383.       if (ai.gIndex === 0 && gi.title && (!item.desc || !safeIncludes(item.desc, gi.title)))
  384.         c += gi.title + (item.desc ? ' - ' : '');
  385.       if (item.desc)
  386.         c += item.desc;
  387.       App.setBar(c.trim() || ' ', 'gallery', true);
  388.     } else if ('caption' in ai) {
  389.       App.setBar(ai.caption, 'caption');
  390.     } else if (ai.tooltip) {
  391.       App.setBar(ai.tooltip.text, 'tooltip');
  392.     } else {
  393.       App.setBar(' ', 'info');
  394.     }
  395.   }
  396.  
  397.   static updateMouse(e) {
  398.     const cx = ai.clientX = e.clientX;
  399.     const cy = ai.clientY = e.clientY;
  400.     const r = ai.rect;
  401.     if (r)
  402.       ai.isOverRect =
  403.         cx > r.left - 2 && cx < r.right + 2 &&
  404.         cy > r.top - 2 && cy < r.bottom + 2;
  405.   }
  406.  
  407.   static updateProgress() {
  408.     App.stopTimers();
  409.     let wait;
  410.     if (ai.preloadStart && (wait = ai.preloadStart + cfg.delay - Date.now()) > 0)
  411.       return (ai.timer = setTimeout(App.checkProgress, wait));
  412.     if ((ai.urls || 0).length && Math.max(ai.nheight, ai.nwidth) < 130) {
  413.       App.handleError({type: 'error'});
  414.       return;
  415.     }
  416.     App.setStatus(false);
  417.     Util.forceLayout(ai.popup);
  418.     ai.popup.className = `${PREFIX}show`;
  419.     App.updateSpacing();
  420.     App.updateScales();
  421.     App.updateTitle();
  422.     Popup.move();
  423.     if (!ai.bar)
  424.       App.updateFileInfo();
  425.     ai.large = ai.nwidth > ai.popup.clientWidth + ai.mbw ||
  426.                ai.nheight > ai.popup.clientHeight + ai.mbh;
  427.     if (ai.large)
  428.       App.setStatus('large');
  429.     if (cfg.imgtab && App.isImageTab || cfg.zoom === 'auto')
  430.       App.toggleZoom();
  431.   }
  432.  
  433.   static updateScales() {
  434.     const scales = cfg.scales.length ? cfg.scales : Config.DEFAULTS.scales.slice();
  435.     const fit = Math.min(
  436.       (ai.view.width - ai.mbw - ai.outline * 2) / ai.nwidth,
  437.       (ai.view.height - ai.mbh - ai.outline * 2) / ai.nheight);
  438.     let cutoff = ai.scale = Math.min(1, fit);
  439.     ai.scales = [];
  440.     for (let i = scales.length; i--;) {
  441.       const scale = scales[i];
  442.       const val = parseFloat(scale) || fit;
  443.       const option = typeof scale === 'string' && scale.slice(-1);
  444.       if (option === '!')
  445.         cutoff = val;
  446.       if (option === '*')
  447.         ai.zscale = val;
  448.       if (val !== ai.scale)
  449.         ai.scales.push(val);
  450.     }
  451.     ai.scales = ai.scales
  452.       .filter(x => x >= cutoff)
  453.       .sort((a, b) => a - b);
  454.     ai.scales.unshift(ai.scale);
  455.   }
  456.  
  457.   static updateSpacing() {
  458.     const s = getComputedStyle(ai.popup);
  459.     ai.outline = sumProps(s.outlineOffset, s.outlineWidth);
  460.     ai.pw = sumProps(s.paddingLeft, s.paddingRight);
  461.     ai.ph = sumProps(s.paddingTop, s.paddingBottom);
  462.     ai.mbw = sumProps(s.marginLeft, s.marginRight, s.borderLeftWidth, s.borderRightWidth);
  463.     ai.mbh = sumProps(s.marginTop, s.marginBottom, s.borderTopWidth, s.borderBottomWidth);
  464.   }
  465.  
  466.   static updateStyles() {
  467.     Util.addStyle('global', /*language=CSS*/ App.globalStyle || (App.globalStyle = `
  468.       #${PREFIX}bar {
  469.         position: fixed;
  470.         z-index: 2147483647;
  471.         left: 0;
  472.         right: 0;
  473.         top: 0;
  474.         opacity: 0;
  475.         transition: opacity 1s ease .25s;
  476.         text-align: center;
  477.         font-family: sans-serif;
  478.         font-size: 15px;
  479.         font-weight: bold;
  480.         background: #0005;
  481.         color: white;
  482.         padding: 4px 10px;
  483.         text-shadow: .5px .5px 2px #000;
  484.       }
  485.       #${PREFIX}bar.${PREFIX}show {
  486.         opacity: 1;
  487.       }
  488.       #${PREFIX}bar[data-zoom]::after {
  489.         content: " (" attr(data-zoom) ")";
  490.         opacity: .8;
  491.       }
  492.       #${PREFIX}popup.${PREFIX}show {
  493.         display: inline;
  494.       }
  495.       #${PREFIX}popup {
  496.         display: none;
  497.         border: none;
  498.         box-sizing: content-box;
  499.         position: fixed;
  500.         z-index: 2147483647;
  501.         margin: 0;
  502.         max-width: none;
  503.         max-height: none;
  504.         will-change: display, width, height, left, top;
  505.         cursor: none;
  506.         animation: .2s ${PREFIX}fadein both;
  507.       }
  508.       #${PREFIX}popup.${PREFIX}show {
  509.         box-shadow: 6px 6px 30px transparent;
  510.         transition: box-shadow .25s, background-color .25s;
  511.       }
  512.       #${PREFIX}popup.${PREFIX}show[loaded] {
  513.         box-shadow: 6px 6px 30px black;
  514.         background-color: white;
  515.       }
  516.       #${PREFIX}popup.${PREFIX}zoom-max {
  517.         image-rendering: pixelated;
  518.       }
  519.       @keyframes ${PREFIX}fadein {
  520.         from { opacity: 0; }
  521.         to { opacity: 1; }
  522.       }` + (
  523.       cfg.globalStatus ? `
  524.         .${PREFIX}loading:not(.${PREFIX}preloading) * {
  525.           cursor: wait !important;
  526.         }
  527.         .${PREFIX}edge #${PREFIX}popup {
  528.           cursor: default;
  529.         }
  530.         .${PREFIX}error * {
  531.           cursor: not-allowed !important;
  532.         }
  533.         .${PREFIX}ready *, .${PREFIX}large * {
  534.           cursor: zoom-in !important;
  535.         }
  536.         .${PREFIX}shift * {
  537.           cursor: default !important;
  538.         }
  539.       ` : `
  540.         [${STATUS_ATTR}~="loading"]:not([${STATUS_ATTR}~="preloading"]) {
  541.           cursor: wait !important;
  542.         }
  543.         #${PREFIX}popup[${STATUS_ATTR}~="edge"] {
  544.           cursor: default !important;
  545.         }
  546.         [${STATUS_ATTR}~="error"] {
  547.           cursor: not-allowed !important;
  548.         }
  549.         [${STATUS_ATTR}~="ready"],
  550.         [${STATUS_ATTR}~="large"] {
  551.           cursor: zoom-in !important;
  552.         }
  553.         [${STATUS_ATTR}~="shift"] {
  554.           cursor: default !important;
  555.         }
  556.       `
  557.     ) + (/*language=none*/
  558.       cfg.css.includes('{') ? cfg.css : `#${PREFIX}popup {${cfg.css}}`
  559.     )));
  560.     Util.addStyle('rule', ai.rule.css || '');
  561.   }
  562.  
  563.   static updateTitle() {
  564.     if (!ai.bar)
  565.       return;
  566.     const zoom = ai.nwidth && `${
  567.       Math.round(ai.scale * 100)
  568.     }%, ${
  569.       ai.nwidth
  570.     } x ${
  571.       ai.nheight
  572.     } px, ${
  573.       Math.round(100 * (ai.nwidth * ai.nheight / 1e6)) / 100
  574.     } MP`.replace(/\x20/g, '\xA0');
  575.     if (ai.bar.dataset.zoom !== zoom || !ai.nwidth) {
  576.       if (zoom) ai.bar.dataset.zoom = zoom;
  577.       else delete ai.bar.dataset.zoom;
  578.       App.updateBar();
  579.     }
  580.   }
  581. }
  582.  
  583. class Config {
  584.   constructor({data: c = GM_getValue('cfg'), save}) {
  585.     if (typeof c === 'string')
  586.       c = tryCatch(JSON.parse, c);
  587.     if (typeof c !== 'object' || !c)
  588.       c = {};
  589.     const {DEFAULTS} = Config;
  590.     if (c.version !== DEFAULTS.version) {
  591.       if (typeof c.hosts === 'string')
  592.         c.hosts = c.hosts.split('\n')
  593.           .map(s => tryCatch(JSON.parse, s) || s)
  594.           .filter(Boolean);
  595.       if (c.close === true || c.close === false)
  596.         c.zoomOut = c.close ? 'auto' : 'stay';
  597.       for (const key in DEFAULTS)
  598.         if (typeof c[key] !== typeof DEFAULTS[key])
  599.           c[key] = DEFAULTS[key];
  600.       if (c.version === 3 && c.scales[0] === 0)
  601.         c.scales[0] = '0!';
  602.       for (const key in c)
  603.         if (!(key in DEFAULTS))
  604.           delete c[key];
  605.       c.version = DEFAULTS.version;
  606.       if (save)
  607.         GM_setValue('cfg', JSON.stringify(c));
  608.     }
  609.     if (cfg && (
  610.       cfg.css !== c.css ||
  611.       cfg.globalStatus !== c.globalStatus
  612.     )) {
  613.       App.globalStyle = '';
  614.     }
  615.     Object.assign(this, c);
  616.   }
  617. }
  618.  
  619. class Ruler {
  620. /*
  621.  'u' works only with URLs so it's ignored if 'html' is true
  622.    ||some.domain = matches some.domain, anything.some.domain, etc.
  623.    |foo = url or text must start with foo
  624.    ^ = separator like / or ? or : but not a letter/number, not %._-
  625.        when used at the end like "foo^" it additionally matches when the source ends with "foo"
  626.  'r' is checked only if 'u' matches first
  627. */
  628.   static init() {
  629.     const errors = new Map();
  630.     const customRules = (cfg.hosts || []).map(Ruler.parse, errors);
  631.     for (const rule of errors.keys())
  632.       App.handleError('Invalid custom host rule:', rule);
  633.  
  634.     // rules that disable previewing
  635.     const disablers = [
  636.       dotDomain.endsWith('.stackoverflow.com') && {
  637.         e: '.post-tag, .post-tag img',
  638.         s: '',
  639.       },
  640.       {
  641.         u: '||disqus.com/',
  642.         s: '',
  643.       },
  644.     ];
  645.  
  646.     // optimization: a rule is created only when on domain
  647.     const perDomain = [
  648.       hostname.includes('startpage') && {
  649.         r: /\boiu=(.+)/,
  650.         s: '$1',
  651.         follow: true,
  652.       },
  653.       dotDomain.endsWith('.4chan.org') && {
  654.         e: '.is_catalog .thread a[href*="/thread/"], .catalog-thread a[href*="/thread/"]',
  655.         q: '.op .fileText a',
  656.         css: '#post-preview{display:none}',
  657.       },
  658.       hostname.includes('amazon.') && {
  659.         r: /.+?images\/I\/.+?\./,
  660.         s: m => {
  661.           const uh = doc.getElementById('universal-hover');
  662.           return uh ? '' : m[0] + 'jpg';
  663.         },
  664.         css: '#zoomWindow{display:none!important;}',
  665.       },
  666.       dotDomain.endsWith('.bing.com') && {
  667.         e: 'a[m*="murl"]',
  668.         r: /murl&quot;:&quot;(.+?)&quot;/,
  669.         s: '$1',
  670.         html: true,
  671.       },
  672.       dotDomain.endsWith('.deviantart.com') && {
  673.         e: '[data-super-full-img] *, img[src*="/th/"]',
  674.         s: (m, node) =>
  675.           $propUp(node, 'data-super-full-img') ||
  676.           (node = node.dataset.embedId && node.nextElementSibling) &&
  677.           node.dataset.embedId && node.src,
  678.       },
  679.       dotDomain.endsWith('.deviantart.com') && {
  680.         e: '.dev-view-deviation img',
  681.         s: () => [
  682.           $('.dev-page-download').href,
  683.           $('.dev-content-full').src,
  684.         ].filter(Boolean),
  685.       },
  686.       dotDomain.endsWith('.deviantart.com') && {
  687.         u: ',strp/',
  688.         s: '/\\/v1\\/.*//',
  689.       },
  690.       dotDomain.endsWith('.dropbox.com') && {
  691.         r: /(.+?&size_mode)=\d+(.*)/,
  692.         s: '$1=5$2',
  693.       },
  694.       dotDomain.endsWith('.facebook.com') && {
  695.         e: 'a[href*="ref=hovercard"]',
  696.         s: (m, node) =>
  697.           'https://www.facebook.com/photo.php?fbid=' +
  698.           /\/[0-9]+_([0-9]+)_/.exec($('img', node).src)[1],
  699.         follow: true,
  700.       },
  701.       dotDomain.endsWith('.facebook.com') && {
  702.         r: /(fbcdn|external).*?(app_full_proxy|safe_image).+?(src|url)=(http.+?)[&"']/,
  703.         s: (m, node) =>
  704.           node.parentNode.className.includes('video') && m[4].includes('fbcdn') ? '' :
  705.             decodeURIComponent(m[4]),
  706.         html: true,
  707.         follow: true,
  708.       },
  709.       dotDomain.endsWith('.flickr.com') &&
  710.       tryCatch(() => unsafeWindow.YUI_config.flickr.api.site_key) && {
  711.         r: /flickr\.com\/photos\/[^/]+\/(\d+)/,
  712.         s: m => `https://www.flickr.com/services/rest/?${
  713.           new URLSearchParams({
  714.             photo_id: m[1],
  715.             api_key: unsafeWindow.YUI_config.flickr.api.site_key,
  716.             method: 'flickr.photos.getSizes',
  717.             format: 'json',
  718.             nojsoncallback: 1,
  719.           }).toString()}`,
  720.         q: text => JSON.parse(text).sizes.size.pop().source,
  721.       },
  722.       dotDomain.endsWith('.github.com') && {
  723.         r: new RegExp([
  724.           /(avatars.+?&s=)\d+/,
  725.           /(raw\.github)(\.com\/.+?\/img\/.+)$/,
  726.           /\/(github)(\.com\/.+?\/)blob\/([^/]+\/.+?\.(?:png|jpe?g|bmp|gif|cur|ico))$/,
  727.         ].map(rx => rx.source).join('|')),
  728.         s: m => `https://${
  729.           m[1] ? `${m[1]}460` :
  730.             m[2] ? `${m[2]}usercontent${m[3]}` :
  731.               `raw.${m[4]}usercontent${m[5]}${m[6]}`
  732.         }`,
  733.       },
  734.       isGoogleImages && {
  735.         e: 'a',
  736.         r: /imgres\?imgurl=([^&]+)/,
  737.         s: '$1',
  738.       },
  739.       isGoogleImages && {
  740.         e: '[data-tbnid] a',
  741.         s: (m, node, rule) => {
  742.           const id = $propUp(node, 'data-tbnid');
  743.           for (const {text} of $$('script', doc)) {
  744.             let i = text.indexOf(id);
  745.             if (i < 0) continue;
  746.             i = text.indexOf('[', i + id.length + 9) + 2;
  747.             const url = text.slice(i, text.indexOf('"', i + 1));
  748.             if (!url.startsWith('http')) continue;
  749.             rule.xhr = !url.startsWith(location.protocol);
  750.             return url;
  751.           }
  752.         },
  753.       },
  754.       dotDomain.endsWith('.instagram.com') && {
  755.         e: [
  756.           'a[href*="/p/"]',
  757.           'a[role="button"][data-reactid*="scontent-"]',
  758.           'article div',
  759.           'article div div img',
  760.         ],
  761.         s: (m, node, rule) => {
  762.           const {a, data} = rule._getData(node) || {};
  763.           rule.follow = !data;
  764.           return (
  765.             !a ? false :
  766.               !data ? a.href :
  767.                 data.video_url || data.display_url);
  768.         },
  769.         c: (html, doc, node, rule) =>
  770.           tryCatch(() => rule._getData(node).data.edge_media_to_caption.edges[0].node.text) || '',
  771.         follow: true,
  772.         _getData(node) {
  773.           const n = node.closest('a[href*="/p/"], article');
  774.           if (!n)
  775.             return;
  776.           const a = n.tagName === 'A' ? n : $('a[href*="/p/"]', n);
  777.           if (!a)
  778.             return;
  779.           try {
  780.             const shortcode = a.pathname.match(/\/p\/(\w+)/)[1];
  781.             return {
  782.               a,
  783.               data: unsafeWindow._sharedData.entry_data.ProfilePage[0]
  784.                 .graphql.user.edge_owner_to_timeline_media.edges
  785.                 .find(e => e.node.shortcode === shortcode)
  786.                 .node,
  787.             };
  788.           } catch (e) {
  789.             return {a};
  790.           }
  791.         },
  792.       },
  793.       ...dotDomain.endsWith('.reddit.com') && [{
  794.         u: '||i.reddituploads.com/',
  795.       }, {
  796.         e: '[data-url*="i.redd.it"] img[src*="thumb"]',
  797.         s: (m, node) => $propUp(node, 'data-url'),
  798.       }, {
  799.         r: /preview(\.redd\.it\/\w+\.(jpe?g|png|gif))/,
  800.         s: 'https://i$1',
  801.       }] || [],
  802.       dotDomain.endsWith('.tumblr.com') && {
  803.         e: 'div.photo_stage_img, div.photo_stage > canvas',
  804.         s: (m, node) => /http[^"]+/.exec(node.style.cssText + node.getAttribute('data-img-src'))[0],
  805.         follow: true,
  806.       },
  807.       dotDomain.endsWith('.tweetdeck.twitter.com') && {
  808.         e: 'a.media-item, a.js-media-image-link',
  809.         s: (m, node) => /http[^)]+/.exec(node.style.backgroundImage)[0],
  810.         follow: true,
  811.       },
  812.       dotDomain.endsWith('.twitter.com') && {
  813.         e: '.grid-tweet > .media-overlay',
  814.         s: (m, node) => node.previousElementSibling.src,
  815.         follow: true,
  816.       },
  817.     ];
  818.  
  819.     const main = [
  820.       {
  821.         r: /[/?=](https?[^&]+)/,
  822.         s: '$1',
  823.         follow: true,
  824.       },
  825.       {
  826.         u: [
  827.           '||500px.com/photo/',
  828.           '||cl.ly/',
  829.           '||cweb-pix.com/',
  830.           '||ibb.co/',
  831.           '||imgcredit.xyz/image/',
  832.         ],
  833.         r: /\.\w+\/.+/,
  834.         q: 'meta[property="og:image"]',
  835.       },
  836.       {
  837.         u: 'attachment.php',
  838.         r: /attachment\.php.+attachmentid/,
  839.       },
  840.       {
  841.         u: '||abload.de/image',
  842.         q: '#image',
  843.       },
  844.       {
  845.         u: '||deviantart.com/art/',
  846.         s: (m, node) =>
  847.           /\b(film|lit)/.test(node.className) || /in Flash/.test(node.title) ?
  848.             '' :
  849.             m.input,
  850.         q: [
  851.           '#download-button[href*=".jpg"]',
  852.           '#download-button[href*=".jpeg"]',
  853.           '#download-button[href*=".gif"]',
  854.           '#download-button[href*=".png"]',
  855.           '#gmi-ResViewSizer_fullimg',
  856.           'img.dev-content-full',
  857.         ],
  858.       },
  859.       {
  860.         u: '||dropbox.com/s',
  861.         r: /com\/sh?\/.+\.(jpe?g|gif|png)/i,
  862.         q: (text, doc) =>
  863.           $prop('img.absolute-center', 'src', doc).replace(/(size_mode)=\d+/, '$1=5') || false,
  864.       },
  865.       {
  866.         r: /[./]ebay\.[^/]+\/itm\//,
  867.         q: text =>
  868.           text.match(/https?:\/\/i\.ebayimg\.com\/[^.]+\.JPG/i)[0]
  869.             .replace(/~~60_\d+/, '~~60_57'),
  870.       },
  871.       {
  872.         u: '||i.ebayimg.com/',
  873.         s: (m, node) =>
  874.           $('.zoom_trigger_mask', node.parentNode) ? '' :
  875.             m.input.replace(/~~60_\d+/, '~~60_57'),
  876.       },
  877.       {
  878.         u: [
  879.           '||fastpic.ru/big',
  880.           '||fastpic.ru/thumb',
  881.         ],
  882.         r: /\/\/(?:i(\d+)\.)?([^/]+\/)(big|thumb|view)\/([^.]+?)\.(\w+)/,
  883.         s: (m, node, rule) => {
  884.           const a = node.closest('[href*="fastpic.ru"]');
  885.           const am = a && rule.r.exec(decodeURIComponent(a.href)) || [];
  886.           const p = a && am[4].split('/');
  887.           return `https://i${am[1] || m[1] || am[3] === 'view' && p[0]}.${m[2]}big/${
  888.             am[3] === 'big' ? am[4] : m[4]}.${am[5] || m[5]}?noht=1`;
  889.         },
  890.         xhr: () => 'https://fastpic.ru',
  891.       },
  892.       {
  893.         u: '||fastpic.ru/view/',
  894.         q: 'img[src*="/big/"]',
  895.         xhr: true,
  896.       },
  897.       {
  898.         u: '||facebook.com/',
  899.         r: /photo\.php|[^/]+\/photos\//,
  900.         s: (m, node) =>
  901.           node.id === 'fbPhotoImage' ? false :
  902.             /gradient\.png$/.test(m.input) ? '' :
  903.               m.input.replace('www.facebook.com', 'mbasic.facebook.com'),
  904.         q: [
  905.           'div + span > a:first-child:not([href*="tag_faces"])',
  906.           'div + span > a[href*="tag_faces"] ~ a',
  907.         ],
  908.         rect: '#fbProfileCover',
  909.       },
  910.       {
  911.         u: '||fbcdn.',
  912.         r: /fbcdn.+?[0-9]+_([0-9]+)_[0-9]+_[a-z]\.(jpg|png)/,
  913.         s: m =>
  914.           dotDomain.endsWith('.facebook.com') &&
  915.           tryCatch(() => unsafeWindow.PhotoSnowlift.getInstance().stream.cache.image[m[1]].url) ||
  916.           false,
  917.         manual: true,
  918.       },
  919.       {
  920.         u: ['||fbcdn-', 'fbcdn.net/'],
  921.         r: /(https?:\/\/(fbcdn-[-\w.]+akamaihd|[-\w.]+?fbcdn)\.net\/[-\w/.]+?)_[a-z]\.(jpg|png)(\?[0-9a-zA-Z0-9=_&]+)?/,
  922.         s: (m, node) => {
  923.           if (node.id === 'fbPhotoImage') {
  924.             const a = $('a.fbPhotosPhotoActionsItem[href$="dl=1"]', doc.body);
  925.             if (a)
  926.               return a.href.includes(m.input.match(/[0-9]+_[0-9]+_[0-9]+/)[0]) ? '' : a.href;
  927.           }
  928.           if (m[4])
  929.             return false;
  930.           if (node.parentNode.outerHTML.includes('/hovercard/'))
  931.             return '';
  932.           const gp = node.parentNode.parentNode;
  933.           if (node.outerHTML.includes('profile') && gp.href.includes('/photo'))
  934.             return false;
  935.           return m[1].replace(/\/[spc][\d.x]+/g, '').replace('/v/', '/') + '_n.' + m[3];
  936.         },
  937.         rect: '.photoWrap',
  938.       },
  939.       {
  940.         u: '||flickr.com/photos/',
  941.         r: /photos\/([0-9]+@N[0-9]+|[a-z0-9_-]+)\/([0-9]+)/,
  942.         s: m =>
  943.           m.input.indexOf('/sizes/') < 0 ?
  944.             `https://www.flickr.com/photos/${m[1]}/${m[2]}/sizes/sq/` :
  945.             false,
  946.         q: (text, doc) => {
  947.           const links = $$('.sizes-list a', doc);
  948.           return 'https://www.flickr.com' + links[links.length - 1].getAttribute('href');
  949.         },
  950.         follow: true,
  951.       },
  952.       {
  953.         u: '||flickr.com/photos/',
  954.         r: /\/sizes\//,
  955.         q: '#allsizes-photo > img',
  956.       },
  957.       {
  958.         u: '||gfycat.com/',
  959.         r: /(gfycat\.com\/)(gifs\/detail\/|iframe\/)?([a-z]+)/i,
  960.         s: 'https://$1$3',
  961.         q: [
  962.           'meta[content$=".webm"]',
  963.           '#webmsource',
  964.           'source[src$=".webm"]',
  965.         ],
  966.       },
  967.       {
  968.         u: [
  969.           '||googleusercontent.com/proxy',
  970.           '||googleusercontent.com/gadgets/proxy',
  971.         ],
  972.         r: /\.com\/(proxy|gadgets\/proxy.+?(http.+?)&)/,
  973.         s: m => m[2] ? decodeURIComponent(m[2]) : m.input.replace(/w\d+-h\d+($|-p)/, 'w0-h0'),
  974.       },
  975.       {
  976.         u: [
  977.           '||googleusercontent.com/',
  978.           '||ggpht.com/',
  979.         ],
  980.         s: (m, node) =>
  981.           m.input.includes('webcache.') ||
  982.           node.outerHTML.match(/favicons\?|\b(Ol Rf Ep|Ol Zb ag|Zb HPb|Zb Gtb|Rf Pg|ho PQc|Uk wi hE|go wi Wh|we D0b|Bea)\b/) ||
  983.           node.matches('.g-hovercard *, a[href*="profile_redirector"] > img') ?
  984.             '' :
  985.             m.input.replace(/\/s\d{2,}-[^/]+|\/w\d+-h\d+/, '/s0')
  986.               .replace(/=[-\w]+([&#].*|$)/, ''),
  987.       },
  988.       {
  989.         u: '||gravatar.com/',
  990.         r: /([a-z0-9]{32})/,
  991.         s: 'https://gravatar.com/avatar/$1?s=200',
  992.       },
  993.       {
  994.         u: '//gyazo.com/',
  995.         r: /\.com\/\w{32,}/,
  996.         q: 'meta[name="twitter:image"]',
  997.         xhr: true,
  998.       },
  999.       {
  1000.         u: '||hostingkartinok.com/show-image.php',
  1001.         q: '.image img',
  1002.       },
  1003.       {
  1004.         u: [
  1005.           '||imagecurl.com/images/',
  1006.           '||imagecurl.com/viewer.php',
  1007.         ],
  1008.         r: /(?:images\/(\d+)_thumb|file=(\d+))(\.\w+)/,
  1009.         s: 'https://imagecurl.com/images/$1$2$3',
  1010.       },
  1011.       {
  1012.         u: '||imagebam.com/image/',
  1013.         q: 'meta[property="og:image"]',
  1014.         tabfix: true,
  1015.         xhr: hostname.includes('planetsuzy'),
  1016.       },
  1017.       {
  1018.         u: '||imageban.ru/thumbs',
  1019.         r: /(.+?\/)thumbs(\/\d+)\.(\d+)\.(\d+\/.*)/,
  1020.         s: '$1out$2/$3/$4',
  1021.       },
  1022.       {
  1023.         u: [
  1024.           '||imageban.ru/show',
  1025.           '||imageban.net/show',
  1026.           '||ibn.im/',
  1027.         ],
  1028.         q: '#img_main',
  1029.       },
  1030.       {
  1031.         u: '||imageshack.us/img',
  1032.         r: /img(\d+)\.(imageshack\.us)\/img\\1\/\d+\/(.+?)\.th(.+)$/,
  1033.         s: 'https://$2/download/$1/$3$4',
  1034.       },
  1035.       {
  1036.         u: '||imageshack.us/i/',
  1037.         q: '#share-dl',
  1038.       },
  1039.       {
  1040.         u: '||imageteam.org/img',
  1041.         q: 'img[alt="image"]',
  1042.       },
  1043.       {
  1044.         u: [
  1045.           '||imagetwist.com/',
  1046.           '||imageshimage.com/',
  1047.         ],
  1048.         r: /(\/\/|^)[^/]+\/[a-z0-9]{8,}/,
  1049.         q: 'img.pic',
  1050.         xhr: true,
  1051.       },
  1052.       {
  1053.         u: '||imageupper.com/i/',
  1054.         q: '#img',
  1055.         xhr: true,
  1056.       },
  1057.       {
  1058.         u: '||imagevenue.com/img.php',
  1059.         q: '#thepic',
  1060.       },
  1061.       {
  1062.         u: '||imagezilla.net/show/',
  1063.         q: '#photo',
  1064.         xhr: true,
  1065.       },
  1066.       {
  1067.         u: [
  1068.           '||images-na.ssl-images-amazon.com/images/',
  1069.           '||media-imdb.com/images/',
  1070.         ],
  1071.         r: /images\/.+?\.jpg/,
  1072.         s: '/V1\\.?_.+?\\.//g',
  1073.       },
  1074.       {
  1075.         u: '||imgbox.com/',
  1076.         r: /\.com\/([a-z0-9]+)$/i,
  1077.         q: '#img',
  1078.         xhr: hostname !== 'imgbox.com',
  1079.       },
  1080.       {
  1081.         u: '||imgclick.net/',
  1082.         r: /\.net\/(\w+)/,
  1083.         q: 'img.pic',
  1084.         xhr: true,
  1085.         post: m => `op=view&id=${m[1]}&pre=1&submit=Continue%20to%20image...`,
  1086.       },
  1087.       {
  1088.         u: [
  1089.           '||imgflip.com/i/',
  1090.           '||imgflip.com/gif/',
  1091.         ],
  1092.         r: /\/(i|gif)\/([^/?#]+)/,
  1093.         s: m => `https://i.imgflip.com/${m[2]}${m[1] === 'i' ? '.jpg' : '.mp4'}`,
  1094.       },
  1095.       {
  1096.         u: [
  1097.           '||imgur.com/a/',
  1098.           '||imgur.com/gallery/',
  1099.           '||imgur.com/t/',
  1100.         ],
  1101.         g: async (text, doc, url, m, rule, cb) => {
  1102.           // simplified extraction of JSON as it occupies only one line
  1103.           if (!/(?:mergeConfig\('gallery',\s*|Imgur\.Album\.getInstance\()[\s\S]*?[,\s{"'](?:image|album)\s*:\s*({[^\r\n]+?}),?[\r\n]/.test(text))
  1104.             return;
  1105.           const info = JSON.parse(RegExp.$1);
  1106.           let images = info.is_album ? info.album_images.images : [info];
  1107.           if (info.num_images > images.length) {
  1108.             const url = `https://imgur.com/ajaxalbums/getimages/${info.hash}/hit.json?all=true`;
  1109.             images = JSON.parse((await Remoting.gmXhr(url)).responseText).data.images;
  1110.           }
  1111.           const items = [];
  1112.           for (const img of images || []) {
  1113.             const u = `https://i.imgur.com/${img.hash}`;
  1114.             items.push({
  1115.               url: img.ext === '.gif' && img.animated !== false ?
  1116.                 [`${u}.webm`, `${u}.mp4`, u] :
  1117.                 u + img.ext,
  1118.               desc: [img.title, img.description].filter(Boolean).join(' - '),
  1119.             });
  1120.           }
  1121.           if (images && info.is_album && !safeIncludes(items[0].desc, info.title))
  1122.             items.title = info.title;
  1123.           cb(items);
  1124.         },
  1125.         css: '.post > .hover { display:none!important; }',
  1126.       },
  1127.       {
  1128.         u: '||imgur.com/',
  1129.         r: /((?:[a-z]{2,}\.)?imgur\.com\/)((?:\w+,)+\w*)/,
  1130.         s: 'gallery',
  1131.         g: (text, doc, url, m) =>
  1132.           m[2].split(',').map(id => ({
  1133.             url: `https://i.${m[1]}${id}.jpg`,
  1134.           })),
  1135.       },
  1136.       {
  1137.         u: '||imgur.com/',
  1138.         r: /([a-z]{2,}\.)?imgur\.com\/(r\/[a-z]+\/|[a-z0-9]+#)?([a-z0-9]{5,})($|\?|\.([a-z]+))/i,
  1139.         s: (m, node) => {
  1140.           if (/memegen|random|register|search|signin/.test(m.input))
  1141.             return '';
  1142.           const a = node.closest('a');
  1143.           if (a && a !== node && /(i\.([a-z]+\.)?)?imgur\.com\/(a\/|gallery\/)?/.test(a.href))
  1144.             return false;
  1145.           const id = m[3].replace(/(.{7})[bhm]$/, '$1');
  1146.           const ext = m[5] ? m[5].replace(/gifv?/, 'webm') : 'jpg';
  1147.           const u = `https://i.${(m[1] || '').replace('www.', '')}imgur.com/${id}.`;
  1148.           return ext === 'webm' ?
  1149.             [`${u}webm`, `${u}mp4`, `${u}gif`] :
  1150.             u + ext;
  1151.         },
  1152.       },
  1153.       {
  1154.         u: [
  1155.           '||instagr.am/p/',
  1156.           '||instagram.com/p/',
  1157.         ],
  1158.         s: m => m.input.substr(0, m.input.lastIndexOf('/')) + '/?__a=1',
  1159.         q: text => {
  1160.           const m = JSON.parse(text).graphql.shortcode_media;
  1161.           return m.video_url || m.display_url;
  1162.         },
  1163.         rect: 'div.PhotoGridMediaItem',
  1164.         c: text => {
  1165.           const m = JSON.parse(text).graphql.shortcode_media.edge_media_to_caption.edges[0];
  1166.           return m === undefined ? '(no caption)' : m.node.text;
  1167.         },
  1168.       },
  1169.       {
  1170.         u: [
  1171.           '||livememe.com/',
  1172.           '||lvme.me/',
  1173.         ],
  1174.         r: /\.\w+\/([^.]+)$/,
  1175.         s: 'http://i.lvme.me/$1.jpg',
  1176.       },
  1177.       {
  1178.         u: '||lostpic.net/image',
  1179.         q: '.image-viewer-image img',
  1180.       },
  1181.       {
  1182.         u: '||makeameme.org/meme/',
  1183.         r: /\/meme\/([^/?#]+)/,
  1184.         s: 'https://media.makeameme.org/created/$1.jpg',
  1185.       },
  1186.       {
  1187.         u: '||photobucket.com/',
  1188.         r: /(\d+\.photobucket\.com\/.+\/)(\?[a-z=&]+=)?(.+\.(jpe?g|png|gif))/,
  1189.         s: 'https://i$1$3',
  1190.         xhr: !dotDomain.endsWith('.photobucket.com'),
  1191.       },
  1192.       {
  1193.         u: '||piccy.info/view3/',
  1194.         r: /(.+?\/view3)\/(.*)\//,
  1195.         s: '$1/$2/orig/',
  1196.         q: '#mainim',
  1197.       },
  1198.       {
  1199.         u: '||pimpandhost.com/image/',
  1200.         r: /(.+?\/image\/[0-9]+)/,
  1201.         s: '$1?size=original',
  1202.         q: 'img.original',
  1203.       },
  1204.       {
  1205.         u: [
  1206.           '||pixroute.com/',
  1207.           '||imgspice.com/',
  1208.         ],
  1209.         r: /\.html$/,
  1210.         q: 'img[id]',
  1211.         xhr: true,
  1212.       },
  1213.       {
  1214.         u: '||postima',
  1215.         r: /postima?ge?\.org\/image\/\w+/,
  1216.         q: [
  1217.           'a[href*="dl="]',
  1218.           '#main-image',
  1219.         ],
  1220.       },
  1221.       {
  1222.         u: [
  1223.           '||prntscr.com/',
  1224.           '||prnt.sc/',
  1225.         ],
  1226.         r: /\.\w+\/.+/,
  1227.         q: 'meta[property="og:image"]',
  1228.         xhr: true,
  1229.       },
  1230.       {
  1231.         u: '||radikal.ru/',
  1232.         r: /\.ru\/(fp|.+\.html)/,
  1233.         q: text => text.match(/http:\/\/[a-z0-9]+\.radikal\.ru[a-z0-9/]+\.(jpg|gif|png)/i)[0],
  1234.       },
  1235.       {
  1236.         u: '||tumblr.com',
  1237.         r: /_500\.jpg/,
  1238.         s: ['/_500/_1280/', ''],
  1239.       },
  1240.       {
  1241.         u: '||twimg.com/',
  1242.         r: /\/profile_images/i,
  1243.         s: '/_(reasonably_small|normal|bigger|\\d+x\\d+)\\././g',
  1244.       },
  1245.       {
  1246.         u: '||twimg.com/media/',
  1247.         r: /.+?format=(jpe?g|png|gif)/i,
  1248.         s: '$0&name=large',
  1249.       },
  1250.       {
  1251.         u: '||twimg.com/1/proxy',
  1252.         r: /t=([^&_]+)/i,
  1253.         s: m => atob(m[1]).match(/http.+/),
  1254.       },
  1255.       {
  1256.         u: '||pic.twitter.com/',
  1257.         r: /\.com\/[a-z0-9]+/i,
  1258.         q: text => text.match(/https?:\/\/twitter\.com\/[^/]+\/status\/\d+\/photo\/\d+/i)[0],
  1259.         follow: true,
  1260.       },
  1261.       {
  1262.         u: '||twitpic.com/',
  1263.         r: /\.com(\/show\/[a-z]+)?\/([a-z0-9]+)($|#)/i,
  1264.         s: 'https://twitpic.com/show/large/$2',
  1265.       },
  1266.       {
  1267.         u: '||upix.me/files',
  1268.         s: '/#//',
  1269.       },
  1270.       {
  1271.         u: '||wiki',
  1272.         r: /\/(thumb|images)\/.+\.(jpe?g|gif|png|svg)\/(revision\/)?/i,
  1273.         s: '/\\/thumb(?=\\/)|' +
  1274.            '\\/scale-to-width(-[a-z]+)?\\/[0-9]+|' +
  1275.            '\\/revision\\/latest|\\/[^\\/]+$//g',
  1276.         xhr: !hostname.includes('wiki'),
  1277.       },
  1278.       {
  1279.         u: '||ytimg.com/vi/',
  1280.         r: /(.+?\/vi\/[^/]+)/,
  1281.         s: '$1/0.jpg',
  1282.         rect: '.video-list-item',
  1283.       },
  1284.       {
  1285.         u: '/viewer.php?file=',
  1286.         r: /(.+?)\/viewer\.php\?file=(.+)/,
  1287.         s: '$1/images/$2',
  1288.         xhr: true,
  1289.       },
  1290.       {
  1291.         u: '/thumb_',
  1292.         r: /\/albums.+\/thumb_[^/]/,
  1293.         s: '/thumb_//',
  1294.       },
  1295.       {
  1296.         u: [
  1297.           '.th.jp',
  1298.           '.th.gif',
  1299.           '.th.png',
  1300.         ],
  1301.         r: /(.+?\.)th\.(jpe?g?|gif|png|svg|webm)$/i,
  1302.         s: '$1$2',
  1303.         follow: true,
  1304.       },
  1305.       {
  1306.         u: [
  1307.           '.jp',
  1308.           '.gif',
  1309.           '.png',
  1310.           '.svg',
  1311.           '.webm',
  1312.         ],
  1313.         r: /[^?:]+\.(jpe?g?|gif|png|svg|webm)($|\?)/i,
  1314.       },
  1315.     ];
  1316.  
  1317.     /** @type mpiv.HostRule[] */
  1318.     Ruler.rules = [].concat(customRules, disablers, perDomain, main).filter(Boolean);
  1319.   }
  1320.  
  1321.   static format(rule, {expand} = {}) {
  1322.     const s = JSON.stringify(rule, null, ' ');
  1323.     return expand ?
  1324.       /* {"a": ...,
  1325.           "b": ...,
  1326.           "c": ...
  1327.          } */
  1328.       s.replace(/^{\s+/g, '{') :
  1329.       /* {"a": ..., "b": ..., "c": ...} */
  1330.       s.replace(/\n\s*/g, ' ').replace(/^({)\s|\s+(})$/g, '$1$2');
  1331.   }
  1332.  
  1333.   /** @returns mpiv.HostRule | Error | false | undefined */
  1334.   static parse(rule) {
  1335.     const isBatchOp = this instanceof Map;
  1336.     try {
  1337.       if (typeof rule === 'string')
  1338.         rule = JSON.parse(rule);
  1339.       if ('d' in rule && typeof rule.d !== 'string')
  1340.         rule.d = undefined;
  1341.       else if (isBatchOp && rule.d && !hostname.includes(rule.d))
  1342.         return false;
  1343.       const compileTo = isBatchOp ? rule : {};
  1344.       if (rule.r)
  1345.         compileTo.r = new RegExp(rule.r, 'i');
  1346.       if (RX_HAS_CODE.test(rule.s))
  1347.         compileTo.s = Util.newFunction('m', 'node', 'rule', rule.s);
  1348.       if (RX_HAS_CODE.test(rule.q))
  1349.         compileTo.q = Util.newFunction('text', 'doc', 'node', 'rule', rule.q);
  1350.       if (RX_HAS_CODE.test(rule.c))
  1351.         compileTo.c = Util.newFunction('text', 'doc', 'node', 'rule', rule.c);
  1352.       return rule;
  1353.     } catch (e) {
  1354.       if (!e.message.includes('unsafe-eval'))
  1355.         if (isBatchOp) {
  1356.           this.set(rule, e);
  1357.         } else {
  1358.           return e;
  1359.         }
  1360.     }
  1361.   }
  1362.  
  1363.   static runQ(text, doc, docUrl) {
  1364.     let url;
  1365.     if (typeof ai.rule.q === 'function') {
  1366.       url = ai.rule.q(text, doc, ai.node, ai.rule);
  1367.       if (Array.isArray(url)) {
  1368.         ai.urls = url.slice(1);
  1369.         url = url[0];
  1370.       }
  1371.     } else {
  1372.       const el = $many(ai.rule.q, doc);
  1373.       url = el && Remoting.findImageUrl(el, docUrl);
  1374.     }
  1375.     return url;
  1376.   }
  1377.  
  1378.   static runS(node, rule, m) {
  1379.     let urls = [];
  1380.     for (const s of ensureArray(rule.s))
  1381.       urls.push(
  1382.         typeof s === 'string' ? Util.maybeDecodeUrl(Ruler.substituteSingle(s, m)) :
  1383.           typeof s === 'function' ? s(m, node, rule) :
  1384.             s);
  1385.     if (rule.q && urls.length > 1) {
  1386.       console.warn('Rule discarded: "s" array is not allowed with "q"\n%o', rule);
  1387.       return {skipRule: true};
  1388.     }
  1389.     if (Array.isArray(urls[0]))
  1390.       urls = urls[0];
  1391.     // `false` returned by "s" property means "skip this rule"
  1392.     // any other falsy value (like say "") means "stop all rules"
  1393.     return urls[0] === false ? {skipRule: true} : urls.map(Util.maybeDecodeUrl);
  1394.   }
  1395.  
  1396.   static substituteSingle(s, m) {
  1397.     if (!m)
  1398.       return s;
  1399.     if (s.startsWith('/') && !s.startsWith('//')) {
  1400.       const mid = s.search(/[^\\]\//) + 1;
  1401.       const end = s.lastIndexOf('/');
  1402.       const re = new RegExp(s.slice(1, mid), s.slice(end + 1));
  1403.       return m.input.replace(re, s.slice(mid + 1, end));
  1404.     }
  1405.     if (m.length && s.includes('$')) {
  1406.       const maxLength = Math.floor(Math.log10(m.length)) + 1;
  1407.       s = s.replace(/\$(\d{1,3})/g, (text, num) => {
  1408.         for (let i = maxLength; i >= 0; i--) {
  1409.           const part = num.slice(0, i) | 0;
  1410.           if (part < m.length)
  1411.             return (m[part] || '') + num.slice(i);
  1412.         }
  1413.         return text;
  1414.       });
  1415.     }
  1416.     return s;
  1417.   }
  1418. }
  1419.  
  1420. const SimpleUrlMatcher = (() => {
  1421.   // string-to-regexp escaped chars
  1422.   const RX_ESCAPE = /[.+*?(){}[\]^$|]/g;
  1423.   // rx for '^' symbol in simple url match
  1424.   const RX_SEP = /[^\w%._-]/g;
  1425.   const RXS_SEP = RX_SEP.source;
  1426.   return match => {
  1427.     const results = [];
  1428.     for (const s of ensureArray(match)) {
  1429.       const pinDomain = s.startsWith('||');
  1430.       const pinStart = !pinDomain && s.startsWith('|');
  1431.       const endSep = s.endsWith('^');
  1432.       let fn;
  1433.       let needle = s.slice(pinDomain * 2 + pinStart, -endSep || undefined);
  1434.       if (needle.includes('^')) {
  1435.         const plain = findLongestPart(needle);
  1436.         const rx = new RegExp(
  1437.           (pinStart ? '^' : '') +
  1438.           (pinDomain ? '^(([^/:]+:)?//)?([^./]*\\.)*?' : '') +
  1439.           needle.replace(RX_ESCAPE, '\\$&').replace(/\\\^/g, RXS_SEP) +
  1440.           (endSep ? `(?:${RXS_SEP}|$)` : ''), 'i');
  1441.         needle = [plain, rx];
  1442.         fn = regexp;
  1443.       } else if (pinStart) {
  1444.         fn = endSep ? equals : starts;
  1445.       } else if (pinDomain) {
  1446.         const slashPos = needle.indexOf('/');
  1447.         const domain = slashPos > 0 ? needle.slice(0, slashPos) : needle;
  1448.         needle = [needle, domain, slashPos > 0, endSep];
  1449.         fn = startsDomainPrescreen;
  1450.       } else if (endSep) {
  1451.         fn = ends;
  1452.       } else {
  1453.         fn = has;
  1454.       }
  1455.       results.push({fn, this: needle});
  1456.     }
  1457.     return results.length > 1 ?
  1458.       {fn: checkArray, this: results} :
  1459.       results[0];
  1460.   };
  1461.   function checkArray(s) {
  1462.     return this.some(checkArrayItem, s);
  1463.   }
  1464.   function checkArrayItem(item) {
  1465.     return item.fn.call(item.this, this);
  1466.   }
  1467.   function equals(s) {
  1468.     return s.startsWith(this) && (
  1469.       s.length === this.length ||
  1470.       s.length === this.length + 1 && endsWithSep(s));
  1471.   }
  1472.   function starts(s) {
  1473.     return s.startsWith(this);
  1474.   }
  1475.   function ends(s) {
  1476.     return s.endsWith(this) || (
  1477.       s.length > this.length &&
  1478.       s.indexOf(this, s.length - this.length - 1) >= 0 &&
  1479.       endsWithSep(s));
  1480.   }
  1481.   function has(s) {
  1482.     return s.includes(this);
  1483.   }
  1484.   function regexp(s) {
  1485.     return s.includes(this[0]) && this[1].test(s);
  1486.   }
  1487.   function endsWithSep(s) {
  1488.     RX_SEP.lastIndex = s.length - 1;
  1489.     return RX_SEP.test(s);
  1490.   }
  1491.   function startsDomainPrescreen(url) {
  1492.     return url.includes(this[0]) && startsDomain.call(this, url);
  1493.   }
  1494.   function startsDomain(url) {
  1495.     const [p, gap, host] = url.split('/', 3);
  1496.     if (gap || p && !p.endsWith(':'))
  1497.       return;
  1498.     const [needle, domain, pinDomainEnd, endSep] = this;
  1499.     let start = pinDomainEnd ? host.length - domain.length : 0;
  1500.     for (; ; start++) {
  1501.       start = host.indexOf(domain, start);
  1502.       if (start < 0)
  1503.         return;
  1504.       if (!start || host[start - 1] === '.')
  1505.         break;
  1506.     }
  1507.     start += p.length + 2;
  1508.     return url.lastIndexOf(needle, start) === start &&
  1509.            (!endSep || start + needle.length === url.length);
  1510.   }
  1511.   function findLongestPart(s) {
  1512.     const len = s.length;
  1513.     let maxLen = 0;
  1514.     let start;
  1515.     for (let i = 0, j; i < len; i = j + 1) {
  1516.       j = s.indexOf('^', i);
  1517.       if (j < 0)
  1518.         j = len;
  1519.       if (j - i > maxLen) {
  1520.         maxLen = j - i;
  1521.         start = i;
  1522.       }
  1523.     }
  1524.     return maxLen < len ? s.substr(start, maxLen) : s;
  1525.   }
  1526. })();
  1527.  
  1528. class RuleMatcher {
  1529.  
  1530.   /** @returns ?mpiv.RuleMatchInfo */
  1531.   static findForLink(a) {
  1532.     let url =
  1533.       a.getAttribute('data-expanded-url') ||
  1534.       a.getAttribute('data-full-url') ||
  1535.       a.getAttribute('data-url') ||
  1536.       a.href;
  1537.     if (url.startsWith('data:'))
  1538.       url = false;
  1539.     else if (url.includes('//t.co/'))
  1540.       url = 'http://' + a.textContent;
  1541.     return RuleMatcher.find(url, a);
  1542.   }
  1543.  
  1544.   /** @returns ?mpiv.RuleMatchInfo */
  1545.   static find(url, node, {noHtml, skipRule} = {}) {
  1546.     const tn = node.tagName;
  1547.     let m, html, urls;
  1548.     for (const rule of Ruler.rules) {
  1549.       const {e} = rule;
  1550.       if (e && !node.matches(e) || rule === skipRule)
  1551.         continue;
  1552.       const {r, u} = rule;
  1553.       if (r && !noHtml && rule.html && (tn === 'A' || tn === 'IMG' || e))
  1554.         m = r.exec(html || (html = node.outerHTML));
  1555.       else if (r || u)
  1556.         m = url && RuleMatcher.makeUrlMatch(url, node, rule);
  1557.       else
  1558.         m = url ? RuleMatcher.makeDummyMatch(url) : [];
  1559.       if (!m ||
  1560.           // a rule with follow:true for the currently hovered IMG produced a URL,
  1561.           // but we'll only allow it to match rules without 's' in the nested find call
  1562.           tn === 'IMG' && !('s' in rule) && !skipRule)
  1563.         continue;
  1564.       if (rule.s === '')
  1565.         return {};
  1566.       const hasS = 's' in rule && rule.s !== 'gallery';
  1567.       urls = hasS ? Ruler.runS(node, rule, m) : [m.input];
  1568.       if (!urls.skipRule) {
  1569.         const url = urls[0];
  1570.         return !url ? {} :
  1571.           hasS && !rule.q && RuleMatcher.isFollowableUrl(url, rule) ?
  1572.             RuleMatcher.find(url, node, {skipRule: rule}) :
  1573.             RuleMatcher.makeInfo(urls, node, rule, m);
  1574.       }
  1575.     }
  1576.   }
  1577.  
  1578.   static makeUrlMatch(url, node, rule) {
  1579.     let {r, u} = rule;
  1580.     let m;
  1581.     if (u) {
  1582.       u = rule._u || (rule._u = SimpleUrlMatcher(u));
  1583.       m = u.fn.call(u.this, url) && (r || RuleMatcher.makeDummyMatch(url));
  1584.     }
  1585.     return (m || !u) && r ? r.exec(url) : m;
  1586.   }
  1587.  
  1588.   static makeDummyMatch(url) {
  1589.     const m = [url];
  1590.     m.index = 0;
  1591.     m.input = url;
  1592.     return m;
  1593.   }
  1594.  
  1595.   /** @returns mpiv.RuleMatchInfo */
  1596.   static makeInfo(urls, node, rule, m) {
  1597.     const url = urls[0];
  1598.     const info = {
  1599.       node,
  1600.       rule,
  1601.       url,
  1602.       urls: urls.length > 1 ? urls.slice(1) : null,
  1603.       match: m,
  1604.       gallery: rule.g && Gallery.makeParser(rule.g),
  1605.       post: typeof rule.post === 'function' ? rule.post(m) : rule.post,
  1606.       xhr: cfg.xhr && rule.xhr,
  1607.     };
  1608.     Util.lazyGetRect(info, node, rule.rect);
  1609.     if (
  1610.       dotDomain.endsWith('.twitter.com') && !/(facebook|google|twimg|twitter)\.com\//.test(url) ||
  1611.       dotDomain.endsWith('.github.com') && !/github/.test(url) ||
  1612.       dotDomain.endsWith('.facebook.com') && /\bimgur\.com/.test(url)
  1613.     ) {
  1614.       info.xhr = 'data';
  1615.     }
  1616.     return info;
  1617.   }
  1618.  
  1619.   static isFollowableUrl(url, rule) {
  1620.     const f = rule.follow;
  1621.     return typeof f === 'function' ? f(url) : f;
  1622.   }
  1623. }
  1624.  
  1625. class Events {
  1626.  
  1627.   static onMouseOver(e) {
  1628.     if (!App.enabled || e.shiftKey || ai.zoom)
  1629.       return;
  1630.     let node = e.target;
  1631.     if (node === ai.popup ||
  1632.         node === doc.body ||
  1633.         node === doc.documentElement)
  1634.       return;
  1635.  
  1636.     if (node.shadowRoot)
  1637.       node = Events.pierceShadow(node, e.clientX, e.clientY);
  1638.  
  1639.     if (!Ruler.rules)
  1640.       Ruler.init();
  1641.  
  1642.     let a, img, url, info;
  1643.     if (node.tagName === 'A') {
  1644.       a = node;
  1645.     } else {
  1646.       if (node.tagName === 'IMG') {
  1647.         img = node;
  1648.         url = !img.src.startsWith('data:') && Util.rel2abs(img.src, location.href);
  1649.       }
  1650.       info = RuleMatcher.find(url, node);
  1651.       a = !info && node.closest('a');
  1652.     }
  1653.  
  1654.     if (!info && a)
  1655.       info = RuleMatcher.findForLink(a);
  1656.  
  1657.     if (!info && img) {
  1658.       info = Util.lazyGetRect({
  1659.         url: img.src,
  1660.         node: img,
  1661.         rule: {},
  1662.       }, img);
  1663.     }
  1664.  
  1665.     if (info && info.url && info.node !== ai.node)
  1666.       App.activate(info, e);
  1667.   }
  1668.  
  1669.   static pierceShadow(node, x, y) {
  1670.     for (let root; (root = node.shadowRoot);) {
  1671.       root.addEventListener('mouseover', Events.onMouseOver, PASSIVE);
  1672.       root.addEventListener('mouseout', Events.onMouseOutShadow);
  1673.       const inner = root.elementFromPoint(x, y);
  1674.       if (!inner || inner === node)
  1675.         break;
  1676.       node = inner;
  1677.     }
  1678.     return node;
  1679.   }
  1680.  
  1681.   static onMouseOut(e) {
  1682.     if (!e.relatedTarget && !e.shiftKey)
  1683.       App.deactivate();
  1684.   }
  1685.  
  1686.   static onMouseOutShadow(e) {
  1687.     const root = e.target.shadowRoot;
  1688.     if (root) {
  1689.       root.removeEventListener('mouseover', Events.onMouseOver);
  1690.       root.removeEventListener('mouseout', Events.onMouseOutShadow);
  1691.     }
  1692.   }
  1693.  
  1694.   static onMouseMove(e) {
  1695.     App.updateMouse(e);
  1696.     if (e.shiftKey)
  1697.       return (ai.lazyUnload = true);
  1698.     if (!ai.zoomed && !ai.isOverRect)
  1699.       return App.deactivate();
  1700.     if (ai.zoom) {
  1701.       Popup.move();
  1702.       const {height: h, width: w} = ai.view;
  1703.       const {clientX: cx, clientY: cy} = ai;
  1704.       const bx = w / 6;
  1705.       const by = h / 6;
  1706.       const onEdge = cx < bx || cx > w - bx || cy < by || cy > h - by;
  1707.       App.setStatus(`${onEdge ? '+' : '-'}edge`);
  1708.     }
  1709.   }
  1710.  
  1711.   static onMouseDown({shiftKey, button}) {
  1712.     if (button === 0 && shiftKey && ai.popup && ai.popup.controls) {
  1713.       ai.controlled = ai.zoomed = true;
  1714.     } else if (button === 2 || shiftKey) {
  1715.       // we ignore RMB and Shift
  1716.     } else {
  1717.       App.deactivate({wait: true});
  1718.     }
  1719.   }
  1720.  
  1721.   static onMouseScroll(e) {
  1722.     const dir = (e.deltaY || -e.wheelDelta) > 0 ? 1 : -1;
  1723.     if (ai.zoom) {
  1724.       dropEvent(e);
  1725.       const i = ai.scales.indexOf(ai.scale) - dir;
  1726.       const n = ai.scales.length;
  1727.       if (i >= 0 && i < n)
  1728.         ai.scale = ai.scales[i];
  1729.       if (i === 0 && cfg.zoomOut !== 'stay') {
  1730.         if ((cfg.zoomOut === 'close' || !ai.isOverRect) &&
  1731.             (!ai.gItems || ai.gItems.length < 2))
  1732.           return App.deactivate({wait: true});
  1733.         ai.zoom = false;
  1734.         ai.zoomed = false;
  1735.         App.updateFileInfo();
  1736.       } else {
  1737.         ai.popup.classList.toggle(`${PREFIX}zoom-max`, ai.scale >= 4 && i >= n - 1);
  1738.       }
  1739.       if (ai.zooming)
  1740.         ai.popup.classList.add(`${PREFIX}zooming`);
  1741.       Popup.move();
  1742.       App.updateTitle();
  1743.     } else if (ai.gItems && ai.gItems.length > 1 && ai.popup) {
  1744.       dropEvent(e);
  1745.       Gallery.next(dir);
  1746.     } else if (cfg.zoom === 'wheel' && dir < 0 && ai.popup) {
  1747.       dropEvent(e);
  1748.       App.toggleZoom();
  1749.     } else {
  1750.       App.deactivate();
  1751.     }
  1752.   }
  1753.  
  1754.   static onKeyDown(e) {
  1755.     switch (e.key) {
  1756.       case 'Shift':
  1757.         App.setStatus('+shift');
  1758.         if (ai.popup && 'controls' in ai.popup)
  1759.           ai.popup.controls = true;
  1760.         break;
  1761.       case 'Control':
  1762.         if (!ai.popup && (cfg.start !== 'auto' || ai.rule.manual))
  1763.           Popup.start();
  1764.         break;
  1765.     }
  1766.   }
  1767.  
  1768.   static onKeyUp(e) {
  1769.     switch (e.key.length > 1 ? e.key : e.code) {
  1770.       case 'Shift':
  1771.         App.setStatus('-shift');
  1772.         if ((ai.popup || {}).controls)
  1773.           ai.popup.controls = false;
  1774.         if (ai.controlled) {
  1775.           ai.controlled = false;
  1776.           return;
  1777.         }
  1778.         ai.popup && (ai.zoomed || ai.isOverRect !== false) ?
  1779.           App.toggleZoom() :
  1780.           App.deactivate({wait: true});
  1781.         break;
  1782.       case 'Control':
  1783.         break;
  1784.       case 'Escape':
  1785.         App.deactivate({wait: true});
  1786.         break;
  1787.       case 'ArrowRight':
  1788.       case 'KeyJ':
  1789.         dropEvent(e);
  1790.         Gallery.next(1);
  1791.         break;
  1792.       case 'ArrowLeft':
  1793.       case 'KeyK':
  1794.         dropEvent(e);
  1795.         Gallery.next(-1);
  1796.         break;
  1797.       case 'KeyD': {
  1798.         dropEvent(e);
  1799.         Remoting.saveFile();
  1800.         break;
  1801.       }
  1802.       case 'KeyT':
  1803.         ai.lazyUnload = true;
  1804.         GM_openInTab(
  1805.           ai.rule.tabfix && ai.popup.tagName === 'IMG' && !ai.xhr &&
  1806.           navigator.userAgent.includes('Gecko/') ?
  1807.             Util.tabFixUrl() :
  1808.             ai.popup.src);
  1809.         App.deactivate();
  1810.         break;
  1811.       default:
  1812.         App.deactivate({wait: true});
  1813.     }
  1814.   }
  1815.  
  1816.   static onContext(e) {
  1817.     if (e.shiftKey)
  1818.       return;
  1819.     if (cfg.zoom === 'context' && ai.popup && App.toggleZoom()) {
  1820.       dropEvent(e);
  1821.       return;
  1822.     }
  1823.     if (!ai.popup && (
  1824.       cfg.start === 'context' ||
  1825.       (cfg.start === 'auto' && ai.rule.manual)
  1826.     )) {
  1827.       Popup.start();
  1828.       dropEvent(e);
  1829.     } else {
  1830.       setTimeout(App.deactivate, SETTLE_TIME, {wait: true});
  1831.     }
  1832.   }
  1833. }
  1834.  
  1835. class Popup {
  1836.  
  1837.   static schedule(force) {
  1838.     if (!cfg.preload) {
  1839.       ai.timer = setTimeout(Popup.start, cfg.delay);
  1840.     } else if (!force) {
  1841.       // we don't want to preload everything in the path of a quickly moving mouse cursor
  1842.       ai.timer = setTimeout(Popup.schedule, SETTLE_TIME, true);
  1843.       ai.preloadStart = Date.now();
  1844.     } else {
  1845.       Popup.start();
  1846.       App.setStatus('+preloading');
  1847.       setTimeout(App.setStatus, cfg.delay, '-preloading');
  1848.     }
  1849.   }
  1850.  
  1851.   static start() {
  1852.     App.updateStyles();
  1853.     ai.gallery ?
  1854.       Popup.startGallery() :
  1855.       Popup.startSingle();
  1856.   }
  1857.  
  1858.   static startSingle() {
  1859.     App.setStatusLoading();
  1860.     ai.imageUrl = null;
  1861.     if (ai.rule.follow && !ai.rule.q && !ai.rule.s) {
  1862.       Remoting.findRedirect();
  1863.     } else if (ai.rule.q && !Array.isArray(ai.urls)) {
  1864.       Popup.startFromQ();
  1865.     } else {
  1866.       App.updateCaption();
  1867.       Popup.render(ai.url);
  1868.     }
  1869.   }
  1870.  
  1871.   static async startFromQ() {
  1872.     try {
  1873.       const {responseText, doc, finalUrl} = await Remoting.getDoc(ai.url);
  1874.       const url = Ruler.runQ(responseText, doc, finalUrl);
  1875.       if (!url)
  1876.         throw 'File not found.';
  1877.       App.updateCaption(responseText, doc);
  1878.       if (RuleMatcher.isFollowableUrl(url, ai.rule)) {
  1879.         const info = RuleMatcher.find(url, ai.node, {noHtml: true});
  1880.         if (!info || !info.url)
  1881.           throw `Couldn't follow URL: ${url}`;
  1882.         Object.assign(ai, info);
  1883.         Popup.startSingle();
  1884.       } else {
  1885.         Popup.render(url, finalUrl);
  1886.       }
  1887.     } catch (e) {
  1888.       App.handleError(e);
  1889.     }
  1890.   }
  1891.  
  1892.   static async startGallery() {
  1893.     App.setStatusLoading();
  1894.     try {
  1895.       const startUrl = ai.url;
  1896.       const p = ai.rule.s === 'gallery' ? {} :
  1897.         await Remoting.getDoc(startUrl);
  1898.       const items = await new Promise(resolve => {
  1899.         const it = ai.gallery(p.responseText, p.doc, p.finalUrl, ai.match, ai.rule, resolve);
  1900.         if (Array.isArray(it))
  1901.           resolve(it);
  1902.       });
  1903.       // bail out if the gallery's async callback took too long
  1904.       if (ai.url !== startUrl)
  1905.         return;
  1906.       ai.gItems = items.length && items;
  1907.       if (ai.gItems) {
  1908.         ai.gIndex = Gallery.findIndex(ai.url);
  1909.         setTimeout(Gallery.next);
  1910.       } else {
  1911.         throw 'Empty gallery';
  1912.       }
  1913.     } catch (e) {
  1914.       App.handleError(e);
  1915.     }
  1916.   }
  1917.  
  1918.   static async render(src, pageUrl) {
  1919.     Popup.destroy();
  1920.     ai.imageUrl = src;
  1921.     if (ai.xhr && src)
  1922.       src = await Remoting.getImage(src, pageUrl).catch(App.handleError);
  1923.     if (!src)
  1924.       return;
  1925.     const p = ai.popup =
  1926.       src.startsWith('data:video') ||
  1927.       !src.startsWith('data:') && /\.(webm|mp4)($|\?)/.test(src) ?
  1928.         PopupVideo.create() :
  1929.         $create('img');
  1930.     p.id = `${PREFIX}popup`;
  1931.     p.src = src;
  1932.     p.addEventListener('error', App.handleError);
  1933.     p.addEventListener('load', Popup.onLoad, {once: true});
  1934.     if (ai.zooming)
  1935.       p.addEventListener('transitionend', Popup.onZoom);
  1936.     doc.body.insertBefore(p, ai.bar || undefined);
  1937.     App.checkProgress({start: true});
  1938.   }
  1939.  
  1940.   static onLoad() {
  1941.     this.setAttribute('loaded', '');
  1942.     ai.popupLoaded = true;
  1943.     if (!ai.bar)
  1944.       App.updateFileInfo();
  1945.   }
  1946.  
  1947.   static onZoom() {
  1948.     return this.classList.remove(`${PREFIX}zooming`);
  1949.   }
  1950.  
  1951.   static move() {
  1952.     const p = ai.popup;
  1953.     if (!p)
  1954.       return;
  1955.     let x, y;
  1956.     const w = Math.round(ai.scale * ai.nwidth);
  1957.     const h = Math.round(ai.scale * ai.nheight);
  1958.     const cx = ai.clientX;
  1959.     const cy = ai.clientY;
  1960.     const vw = ai.view.width - ai.outline * 2;
  1961.     const vh = ai.view.height - ai.outline * 2;
  1962.     if (!ai.zoom && (!ai.gItems || ai.gItems.length < 2) && !cfg.center) {
  1963.       const r = ai.rect;
  1964.       const rx = (r.left + r.right) / 2;
  1965.       const ry = (r.top + r.bottom) / 2;
  1966.       if (vw - r.right - 40 > w + ai.mbw || w + ai.mbw < r.left - 40) {
  1967.         if (h + ai.mbh < vh - 60)
  1968.           y = clamp(ry - h / 2, 30, vh - h - 30);
  1969.         x = rx > vw / 2 ? r.left - 40 - w : r.right + 40;
  1970.       } else if (vh - r.bottom - 40 > h + ai.mbh || h + ai.mbh < r.top - 40) {
  1971.         if (w + ai.mbw < vw - 60)
  1972.           x = clamp(rx - w / 2, 30, vw - w - 30);
  1973.         y = ry > vh / 2 ? r.top - 40 - h : r.bottom + 40;
  1974.       }
  1975.     }
  1976.     if (x === undefined) {
  1977.       const mid = vw > w ?
  1978.         vw / 2 - w / 2 :
  1979.         -1 * clamp(5 / 3 * (cx / vw - 0.2), 0, 1) * (w - vw);
  1980.       x = Math.round(mid - (ai.pw + ai.mbw) / 2);
  1981.     }
  1982.     if (y === undefined) {
  1983.       const mid = vh > h ?
  1984.         vh / 2 - h / 2 :
  1985.         -1 * clamp(5 / 3 * (cy / vh - 0.2), 0, 1) * (h - vh);
  1986.       y = Math.round(mid - (ai.ph + ai.mbh) / 2);
  1987.     }
  1988.     p.style.cssText = `
  1989.       width: ${w}px !important;
  1990.       height: ${h}px !important;
  1991.       left: ${x + ai.outline}px !important;
  1992.       top: ${y + ai.outline}px !important;
  1993.     `;
  1994.   }
  1995.  
  1996.   static destroy() {
  1997.     const p = ai.popup;
  1998.     if (!p)
  1999.       return;
  2000.     p.removeEventListener('error', App.handleError);
  2001.     if (typeof p.pause === 'function')
  2002.       p.pause();
  2003.     if (!ai.lazyUnload) {
  2004.       if (p.src.startsWith('blob:'))
  2005.         URL.revokeObjectURL(p.src);
  2006.       p.src = '';
  2007.     }
  2008.     p.remove();
  2009.     ai.zoom = false;
  2010.     ai.popupLoaded = false;
  2011.     ai.popup = null;
  2012.   }
  2013. }
  2014.  
  2015. class PopupVideo {
  2016.   static create() {
  2017.     const p = $create('video');
  2018.     p.autoplay = true;
  2019.     p.loop = true;
  2020.     p.volume = 0.5;
  2021.     p.controls = false;
  2022.     p.addEventListener('progress', PopupVideo.progress);
  2023.     p.addEventListener('canplaythrough', PopupVideo.progressDone, {once: true});
  2024.     ai.bufferingBar = false;
  2025.     ai.bufferingStart = Date.now();
  2026.     return p;
  2027.   }
  2028.  
  2029.   static progress() {
  2030.     const {duration} = this;
  2031.     if (duration && this.buffered.length && Date.now() - ai.bufferingStart > 2000) {
  2032.       const pct = Math.round(this.buffered.end(0) / duration * 100);
  2033.       if ((ai.bufferingBar |= pct > 0 && pct < 50))
  2034.         App.setBar(`${pct}% of ${Math.round(duration)}s`, 'xhr');
  2035.     }
  2036.   }
  2037.  
  2038.   static progressDone() {
  2039.     this.removeEventListener('progress', PopupVideo.progress);
  2040.     if (ai.bar && ai.bar.classList.contains(`${PREFIX}xhr`)) {
  2041.       App.setBar(false);
  2042.       App.updateFileInfo();
  2043.     }
  2044.   }
  2045. }
  2046.  
  2047. class Gallery {
  2048.  
  2049.   static makeParser(g) {
  2050.     return (
  2051.       typeof g === 'function' ? g :
  2052.         typeof g === 'string' ? Util.newFunction('text', 'doc', 'url', 'm', 'rule', 'cb', g) :
  2053.           Gallery.defaultParser
  2054.     );
  2055.   }
  2056.  
  2057.   static findIndex(gUrl) {
  2058.     const sel = gUrl.split('#')[1];
  2059.     if (!sel)
  2060.       return 0;
  2061.     if (/^\d+$/.test(sel))
  2062.       return parseInt(sel);
  2063.     for (let i = ai.gItems.length; i--;) {
  2064.       let {url} = ai.gItems[i];
  2065.       if (Array.isArray(url))
  2066.         url = url[0];
  2067.       if (url.indexOf(sel, url.lastIndexOf('/')) > 0)
  2068.         return i;
  2069.     }
  2070.     return 0;
  2071.   }
  2072.  
  2073.   static next(dir) {
  2074.     if (dir > 0 && (ai.gIndex += dir) >= ai.gItems.length) {
  2075.       ai.gIndex = 0;
  2076.     } else if (dir < 0 && (ai.gIndex += dir) < 0) {
  2077.       ai.gIndex = ai.gItems.length - 1;
  2078.     }
  2079.     const item = ai.gItems[ai.gIndex];
  2080.     if (Array.isArray(item.url)) {
  2081.       ai.urls = item.url.slice(1);
  2082.       ai.url = item.url[0];
  2083.     } else {
  2084.       ai.urls = null;
  2085.       ai.url = item.url;
  2086.     }
  2087.     Popup.destroy();
  2088.     Popup.startSingle();
  2089.     App.updateFileInfo();
  2090.     Gallery.preload(dir);
  2091.   }
  2092.  
  2093.   static preload(dir) {
  2094.     const i = ai.gIndex + dir;
  2095.     if (ai.popup && i >= 0 && i < ai.gItems.length) {
  2096.       ai.preloadUrl = ensureArray(ai.gItems[i].url)[0];
  2097.       ai.popup.addEventListener('load', Gallery.preloadOnLoad, {once: true});
  2098.     }
  2099.   }
  2100.  
  2101.   static preloadOnLoad() {
  2102.     $create('img', {src: ai.preloadUrl});
  2103.   }
  2104.  
  2105.   static defaultParser(text, doc, docUrl, m, rule) {
  2106.     const {g} = rule;
  2107.     const qEntry = g.entry;
  2108.     const qCaption = ensureArray(g.caption);
  2109.     const qImage = g.image;
  2110.     const qTitle = g.title;
  2111.     const fix =
  2112.       (typeof g.fix === 'string' ? Util.newFunction('s', 'isURL', g.fix) : g.fix) ||
  2113.       (s => s.trim());
  2114.     const items = [...$$(qEntry || qImage, doc)]
  2115.       .map(processEntry)
  2116.       .filter(Boolean);
  2117.     items.title = processTitle();
  2118.     return items;
  2119.  
  2120.     function processEntry(entry) {
  2121.       const item = {};
  2122.       try {
  2123.         const img = qEntry ? $(qImage, entry) : entry;
  2124.         item.url = fix(Remoting.findImageUrl(img, docUrl), true);
  2125.         item.desc = qCaption.map(processCaption, entry).filter(Boolean).join(' - ');
  2126.       } catch (e) {}
  2127.       return item.url && item;
  2128.     }
  2129.  
  2130.     function processCaption(selector) {
  2131.       const el = $(selector, this) ||
  2132.                  $orSelf(selector, this.previousElementSibling) ||
  2133.                  $orSelf(selector, this.nextElementSibling);
  2134.       return el && fix(el.textContent);
  2135.     }
  2136.  
  2137.     function processTitle() {
  2138.       const el = $(qTitle, doc);
  2139.       return el && fix(el.getAttribute('content') || el.textContent) || '';
  2140.     }
  2141.  
  2142.     function $orSelf(selector, el) {
  2143.       if (el && !el.matches(qEntry))
  2144.         return el.matches(selector) ? el : $(selector, el);
  2145.     }
  2146.   }
  2147. }
  2148.  
  2149. class Remoting {
  2150.  
  2151.   static gmXhr(url, opts = {}) {
  2152.     if (ai.req)
  2153.       tryCatch.call(ai.req, ai.req.abort);
  2154.     return new Promise((resolve, reject) => {
  2155.       ai.req = GM_xmlhttpRequest({
  2156.         url,
  2157.         method: 'GET',
  2158.         timeout: 10e3,
  2159.         ...opts,
  2160.         onload: done,
  2161.         onerror: done,
  2162.         ontimeout() {
  2163.           ai.req = null;
  2164.           reject(`Timeout fetching ${url}`);
  2165.         },
  2166.       });
  2167.       function done(r) {
  2168.         ai.req = null;
  2169.         r.status < 400 && !r.error ?
  2170.           resolve(r) :
  2171.           reject(`Server error ${r.status} ${r.error}\nURL: ${url}`);
  2172.       }
  2173.     });
  2174.   }
  2175.  
  2176.   static async getDoc(url) {
  2177.     const r = await (!ai.post ?
  2178.       Remoting.gmXhr(url) :
  2179.       Remoting.gmXhr(url, {
  2180.         method: 'POST',
  2181.         data: ai.post,
  2182.         headers: {
  2183.           'Content-Type': 'application/x-www-form-urlencoded',
  2184.           'Referer': url,
  2185.         },
  2186.       }));
  2187.     r.doc = new DOMParser().parseFromString(r.responseText, 'text/html');
  2188.     return r;
  2189.   }
  2190.  
  2191.   static async getImage(url, pageUrl) {
  2192.     ai.bufferingBar = false;
  2193.     ai.bufferingStart = Date.now();
  2194.     const response = await Remoting.gmXhr(url, {
  2195.       responseType: 'blob',
  2196.       headers: {
  2197.         Accept: 'image/png,image/*;q=0.8,*/*;q=0.5',
  2198.         Referer: pageUrl || (typeof ai.xhr === 'function' ? ai.xhr() : url),
  2199.       },
  2200.       onprogress: Remoting.getImageProgress,
  2201.     });
  2202.     App.setBar(false);
  2203.     const type = Remoting.guessMimeType(response);
  2204.     let b = response.response;
  2205.     if (b.type !== type)
  2206.       b = b.slice(0, b.size, type);
  2207.     return ai.xhr === 'data' ?
  2208.       Remoting.blobToDataUrl(b) :
  2209.       URL.createObjectURL(b);
  2210.   }
  2211.  
  2212.   static getImageProgress(e) {
  2213.     if (!ai.bufferingBar && Date.now() - ai.bufferingStart > 3000 && e.loaded / e.total < 0.5)
  2214.       ai.bufferingBar = true;
  2215.     if (ai.bufferingBar) {
  2216.       const pct = e.loaded / e.total * 100 | 0;
  2217.       const size = e.total / 1024 | 0;
  2218.       App.setBar(`${pct}% of ${size} kiB`, 'xhr');
  2219.     }
  2220.   }
  2221.  
  2222.   static async findRedirect() {
  2223.     try {
  2224.       const {finalUrl} = await Remoting.gmXhr(ai.url, {
  2225.         method: 'HEAD',
  2226.         headers: {
  2227.           'Referer': location.href.split('#', 1)[0],
  2228.         },
  2229.       });
  2230.       const info = RuleMatcher.find(finalUrl, ai.node, {noHtml: true});
  2231.       if (!info || !info.url)
  2232.         throw `Couldn't follow redirection target: ${finalUrl}`;
  2233.       Object.assign(ai, info);
  2234.       Popup.startSingle();
  2235.     } catch (e) {
  2236.       App.handleError(e);
  2237.     }
  2238.   }
  2239.  
  2240.   static async saveFile() {
  2241.     let url = ai.popup.src || ai.popup.currentSrc;
  2242.     let name = Remoting.getFileName(ai.imageUrl || url);
  2243.     if (!name.includes('.'))
  2244.       name += '.jpg';
  2245.     try {
  2246.       if (!url.startsWith('blob:') && !url.startsWith('data:')) {
  2247.         const {response} = await Remoting.gmXhr(url, {
  2248.           responseType: 'blob',
  2249.           headers: {'Referer': url},
  2250.         });
  2251.         url = URL.createObjectURL(response);
  2252.         setTimeout(() => URL.revokeObjectURL(url), 1000);
  2253.       }
  2254.       $create('a', {href: url, download: name})
  2255.         .dispatchEvent(new MouseEvent('click'));
  2256.     } catch (e) {
  2257.       App.setBar(`Could not download ${name}.`, 'error');
  2258.     }
  2259.   }
  2260.  
  2261.   static getFileName(url) {
  2262.     return decodeURIComponent(url).split('/').pop().replace(/[:#?].*/, '');
  2263.   }
  2264.  
  2265.   static blobToDataUrl(blob) {
  2266.     return new Promise((resolve, reject) => {
  2267.       const fr = new FileReader();
  2268.       fr.onload = () => resolve(fr.result);
  2269.       fr.onerror = reject;
  2270.       fr.readAsDataURL(blob);
  2271.     });
  2272.   }
  2273.  
  2274.   static guessMimeType({responseHeaders, finalUrl}) {
  2275.     if (/Content-Type:\s*(\S+)/i.test(responseHeaders) &&
  2276.         !RegExp.$1.includes('text/plain'))
  2277.       return RegExp.$1;
  2278.     const ext = /\.([a-z0-9]+?)($|\?|#)/i.exec(finalUrl) ? RegExp.$1 : 'jpg';
  2279.     switch (ext.toLowerCase()) {
  2280.       case 'bmp': return 'image/bmp';
  2281.       case 'gif': return 'image/gif';
  2282.       case 'jpe': return 'image/jpeg';
  2283.       case 'jpeg': return 'image/jpeg';
  2284.       case 'jpg': return 'image/jpeg';
  2285.       case 'mp4': return 'video/mp4';
  2286.       case 'png': return 'image/png';
  2287.       case 'svg': return 'image/svg+xml';
  2288.       case 'tif': return 'image/tiff';
  2289.       case 'tiff': return 'image/tiff';
  2290.       case 'webm': return 'video/webm';
  2291.       default: return 'application/octet-stream';
  2292.     }
  2293.   }
  2294.  
  2295.   static findImageUrl(n, url) {
  2296.     let html;
  2297.     const path =
  2298.       n.getAttribute('src') ||
  2299.       n.getAttribute('data-m4v') ||
  2300.       n.getAttribute('href') ||
  2301.       n.getAttribute('content') ||
  2302.       (html = n.outerHTML).includes('http') &&
  2303.       html.match(/https?:\/\/[^\s"<>]+?\.(jpe?g|gif|png|svg|web[mp]|mp4)[^\s"<>]*|$/i)[0];
  2304.     return !!path && Util.rel2abs(Util.decodeHtmlEntities(path),
  2305.       $prop('base[href]', 'href', n.ownerDocument) || url);
  2306.   }
  2307. }
  2308.  
  2309. class Util {
  2310.  
  2311.   static addStyle(name, css) {
  2312.     const id = `${PREFIX}style:${name}`;
  2313.     const el = doc.getElementById(id) ||
  2314.                css && $create('style', {id});
  2315.     if (!el)
  2316.       return;
  2317.     if (el.textContent !== css)
  2318.       el.textContent = css;
  2319.     if (el.parentElement !== doc.head)
  2320.       doc.head.appendChild(el);
  2321.     return el;
  2322.   }
  2323.  
  2324.   static decodeHtmlEntities(s) {
  2325.     return s.replace(/&quot;/g, '"')
  2326.             .replace(/&apos;/g, '\'')
  2327.             .replace(/&lt;/g, '<')
  2328.             .replace(/&gt;/g, '>')
  2329.             .replace(/&amp;/g, '&');
  2330.   }
  2331.  
  2332.   static deepEqual(a, b) {
  2333.     if (typeof a !== typeof b)
  2334.       return false;
  2335.     if (!a || !b || typeof a !== 'object')
  2336.       return a === b;
  2337.     if (Array.isArray(a))
  2338.       return Array.isArray(b) &&
  2339.              a.length === b.length &&
  2340.              a.every((v, i) => Util.deepEqual(v, b[i]));
  2341.     const keys = Object.keys(a);
  2342.     return keys.length === Object.keys(b).length &&
  2343.            keys.every(k => Util.deepEqual(a[k], b[k]));
  2344.   }
  2345.  
  2346.   static findScale(url, parent) {
  2347.     const imgs = $$('img, video', parent);
  2348.     for (let i = imgs.length, img; (img = imgs[--i]);) {
  2349.       if ((img.src || img.currentSrc) !== url)
  2350.         continue;
  2351.       const scaleX = (img.naturalWidth || img.videoWidth) / img.offsetWidth;
  2352.       const scaleY = (img.naturalHeight || img.videoHeight) / img.offsetHeight;
  2353.       const s = Math.max(scaleX, scaleY);
  2354.       if (isFinite(s))
  2355.         return s;
  2356.     }
  2357.   }
  2358.  
  2359.   static forceLayout(node) {
  2360.     // eslint-disable-next-line no-unused-expressions
  2361.     node.clientHeight;
  2362.   }
  2363.  
  2364.   static formatError(e, rule) {
  2365.     let {message} = e;
  2366.     if (!message) {
  2367.       if (e.readyState)
  2368.         message = 'Request failed.';
  2369.       else if (e.type === 'error')
  2370.         message = "File can't be displayed." + (
  2371.           $('div[bgactive*="flashblock"]', doc) ?
  2372.             ' Check Flashblock settings.' :
  2373.             '');
  2374.       else
  2375.         message = e;
  2376.     }
  2377.     const m = [
  2378.       [`${GM_info.script.name}: %c${message}%c`, 'font-weight:bold;color:yellow'],
  2379.       ['', 'font-weight:normal;color:unset'],
  2380.     ];
  2381.     if (rule.u)
  2382.       m.push(['Url simple match: %o', rule.u]);
  2383.     if (rule.e)
  2384.       m.push(['Element match: %o', rule.e]);
  2385.     if (rule.r)
  2386.       m.push(['RegExp match: %o', rule.r]);
  2387.     if (ai.url)
  2388.       m.push(['URL: %s', ai.url]);
  2389.     if (ai.imageUrl && ai.imageUrl !== ai.url)
  2390.       m.push(['File: %s', ai.imageUrl]);
  2391.     m.push(['Node: %o', ai.node]);
  2392.     return {
  2393.       message,
  2394.       consoleFormat: m.map(([k]) => k).filter(Boolean).join('\n'),
  2395.       consoleArgs: m.map(([, v]) => v),
  2396.     };
  2397.   }
  2398.  
  2399.   static lazyGetRect(obj, node, selector) {
  2400.     return Object.defineProperty(obj, 'rect', {
  2401.       configurable: true,
  2402.       get() {
  2403.         const value = Util.rect(node, selector);
  2404.         Object.defineProperty(obj, 'rect', {value, configurable: true});
  2405.         return value;
  2406.       },
  2407.     });
  2408.   }
  2409.  
  2410.   // decode only if the main part of the URL is encoded to preserve the encoded parameters
  2411.   static maybeDecodeUrl(url) {
  2412.     if (!url)
  2413.       return url;
  2414.     const iPct = url.indexOf('%');
  2415.     const iColon = url.indexOf(':');
  2416.     return iPct >= 0 && (iPct < iColon || iColon < 0) ?
  2417.       decodeURIComponent(url) :
  2418.       url;
  2419.   }
  2420.  
  2421.   static newFunction(...args) {
  2422.     try {
  2423.       return App.NOP || new Function(...args);
  2424.     } catch (e) {
  2425.       if (!e.message.includes('unsafe-eval'))
  2426.         throw e;
  2427.       App.NOP = () => {};
  2428.       return App.NOP;
  2429.     }
  2430.   }
  2431.  
  2432.   static rect(node, selector) {
  2433.     let n = selector && node.closest(selector);
  2434.     if (n)
  2435.       return n.getBoundingClientRect();
  2436.     const nested = node.getElementsByTagName('*');
  2437.     let maxArea = 0;
  2438.     let maxBounds;
  2439.     n = node;
  2440.     for (let i = 0; n; n = nested[i++]) {
  2441.       const bounds = n.getBoundingClientRect();
  2442.       const area = bounds.width * bounds.height;
  2443.       if (area > maxArea) {
  2444.         maxArea = area;
  2445.         maxBounds = bounds;
  2446.         node = n;
  2447.       }
  2448.     }
  2449.     return maxBounds;
  2450.   }
  2451.  
  2452.   static rel2abs(rel, abs) {
  2453.     if (rel.startsWith('data:'))
  2454.       return rel;
  2455.     const rx = /^([a-z]+:)\/\//;
  2456.     if (rx.test(rel))
  2457.       return rel;
  2458.     if (!rx.test(abs))
  2459.       return;
  2460.     if (rel.indexOf('//') === 0)
  2461.       return RegExp.$1 + rel;
  2462.     if (rel[0] === '/')
  2463.       return abs.substr(0, abs.indexOf('/', RegExp.lastMatch.length)) + rel;
  2464.     return abs.substr(0, abs.lastIndexOf('/')) + '/' + rel;
  2465.   }
  2466.  
  2467.   static suppressHoverTooltip() {
  2468.     for (const node of [
  2469.       ai.node.parentNode,
  2470.       ai.node,
  2471.       ai.node.firstElementChild,
  2472.     ]) {
  2473.       const t = (node || 0).title;
  2474.       if (t && t !== node.textContent && !doc.title.includes(t) && !/^https?:\S+$/.test(t)) {
  2475.         ai.tooltip = {node, text: t};
  2476.         node.title = '';
  2477.         break;
  2478.       }
  2479.     }
  2480.   }
  2481.  
  2482.   static tabFixUrl() {
  2483.     return `data:text/html;charset=utf8,
  2484.       <style>
  2485.         body {
  2486.           margin: 0;
  2487.           padding: 0;
  2488.           background: #222;
  2489.         }
  2490.         .fit {
  2491.           overflow: hidden
  2492.         }
  2493.         .fit > img {
  2494.           max-width: 100vw;
  2495.           max-height: 100vh;
  2496.         }
  2497.         body > img {
  2498.           margin: auto;
  2499.           position: absolute;
  2500.           left: 0;
  2501.           right: 0;
  2502.           top: 0;
  2503.           bottom: 0;
  2504.         }
  2505.       </style>
  2506.       <body class=fit>
  2507.         <img onclick="document.body.classList.toggle('fit')" src="${ai.popup.src}">
  2508.       </body>
  2509.     `.replace(/\n\s*/g, '').replace(/\x20?([:>])\x20/g, '$1').replace(/#/g, '%23');
  2510.   }
  2511. }
  2512.  
  2513. function setup({rule} = {}) {
  2514.   const MPIV_BASE_URL = 'https://w9p.co/userscripts/mpiv/';
  2515.   const SETUP_ID = `${PREFIX}setup`;
  2516.   const RULE = setup.RULE || (setup.RULE = Symbol('rule'));
  2517.   let div = doc.getElementById(SETUP_ID);
  2518.   let root = div && div.shadowRoot;
  2519.   let {blankRuleElement} = setup;
  2520.   /** @type NodeList */
  2521.   const UI = new Proxy({}, {
  2522.     get(_, id) {
  2523.       return root.getElementById(id);
  2524.     },
  2525.   });
  2526.   if (!rule || !div)
  2527.     init(new Config({save: true}));
  2528.   if (rule)
  2529.     installRule(rule);
  2530.  
  2531.   function closeSetup(event) {
  2532.     if (event && this.id !== 'x') {
  2533.       cfg = collectConfig({save: true, clone: this.id === 'apply'});
  2534.       Ruler.init();
  2535.       if (this.id === 'apply')
  2536.         return;
  2537.     }
  2538.     const el = doc.getElementById(SETUP_ID);
  2539.     el && el.remove();
  2540.   }
  2541.  
  2542.   function collectConfig({save, clone} = {}) {
  2543.     const delay = parseInt(UI.delay.value);
  2544.     const scale = parseFloat(UI.scale.value.replace(',', '.'));
  2545.     let data = {
  2546.       css: UI.css.value.trim(),
  2547.       delay: !isNaN(delay) && delay >= 0 ? delay : undefined,
  2548.       hosts: collectRules(),
  2549.       scale: !isNaN(scale) ? Math.max(1, scale) : undefined,
  2550.       scales: UI.scales.value
  2551.         .trim()
  2552.         .split(/[,;]*\s+/)
  2553.         .map(x => x.replace(',', '.'))
  2554.         .filter(x => !isNaN(parseFloat(x))),
  2555.       start: UI.start.value,
  2556.       zoom: UI.zoom.value,
  2557.       zoomOut: UI.zoomOut.value,
  2558.     };
  2559.     for (const el of $$('[type="checkbox"]', root))
  2560.       data[el.id] = el.checked;
  2561.     if (clone)
  2562.       data = JSON.parse(JSON.stringify(data));
  2563.     return new Config({data, save});
  2564.   }
  2565.  
  2566.   function collectRules() {
  2567.     return [...UI.rules.children]
  2568.       .map(el => [el.value.trim(), el[RULE]])
  2569.       .sort((a, b) => a[0] < b[0] ? -1 : a[0] > b[0] ? 1 : 0)
  2570.       .map(([s, json]) => json || s)
  2571.       .filter(Boolean);
  2572.   }
  2573.  
  2574.   function exportSettings(e) {
  2575.     dropEvent(e);
  2576.     const txt = $create('textarea', {
  2577.       style: 'opacity:0; position:absolute',
  2578.       value: JSON.stringify(collectConfig(), null, '  '),
  2579.     });
  2580.     root.appendChild(txt);
  2581.     txt.select();
  2582.     txt.focus();
  2583.     document.execCommand('copy');
  2584.     e.target.focus();
  2585.     txt.remove();
  2586.     UI.exportNotification.hidden = false;
  2587.     setTimeout(() => (UI.exportNotification.hidden = true), 1000);
  2588.   }
  2589.  
  2590.   function importSettings(e) {
  2591.     dropEvent(e);
  2592.     const s = prompt('Paste settings:');
  2593.     if (s)
  2594.       init(new Config({data: s}));
  2595.   }
  2596.  
  2597.   function checkRule({target: el}) {
  2598.     let json, error;
  2599.     const prev = el.previousElementSibling;
  2600.     if (el.value) {
  2601.       json = Ruler.parse(el.value);
  2602.       error = json instanceof Error && (json.message || String(json));
  2603.       if (!prev)
  2604.         el.insertAdjacentElement('beforebegin', blankRuleElement.cloneNode());
  2605.     } else if (prev) {
  2606.       prev.focus();
  2607.       el.remove();
  2608.     }
  2609.     el[RULE] = !error && json;
  2610.     el.title = error || '';
  2611.     el.setCustomValidity(error || '');
  2612.   }
  2613.  
  2614.   function focusRule({type, target: el, relatedTarget: from}) {
  2615.     if (el === this)
  2616.       return;
  2617.     if (type === 'paste') {
  2618.       setTimeout(() => focusRule.call(this, {target: el}));
  2619.       return;
  2620.     }
  2621.     if (el[RULE])
  2622.       el.value = Ruler.format(el[RULE], {expand: true});
  2623.     const h = clamp(el.scrollHeight, 15, div.clientHeight / 4);
  2624.     if (h > el.offsetHeight)
  2625.       el.style.minHeight = h + 'px';
  2626.     if (!this.contains(from))
  2627.       from = [...$$('[style*="height"]', this)].find(_ => _ !== el);
  2628.     if (from) {
  2629.       from.style.minHeight = '';
  2630.       if (from[RULE])
  2631.         from.value = Ruler.format(from[RULE]);
  2632.     }
  2633.   }
  2634.  
  2635.   function installRule(rule) {
  2636.     const inputs = UI.rules.children;
  2637.     let el = [...inputs].find(el => Util.deepEqual(el[RULE], rule));
  2638.     if (!el) {
  2639.       el = inputs[0];
  2640.       el[RULE] = rule;
  2641.       el.value = Ruler.format(rule);
  2642.       el.hidden = false;
  2643.       const i = Math.max(0, collectRules().indexOf(rule));
  2644.       inputs[i].insertAdjacentElement('afterend', el);
  2645.       inputs[0].insertAdjacentElement('beforebegin', blankRuleElement.cloneNode());
  2646.     }
  2647.     const rect = el.getBoundingClientRect();
  2648.     if (rect.bottom < 0 ||
  2649.         rect.bottom > el.parentNode.offsetHeight)
  2650.       el.scrollIntoView();
  2651.     el.classList.add('highlight');
  2652.     el.addEventListener('animationend', () => el.classList.remove('highlight'), {once: true});
  2653.     el.focus();
  2654.   }
  2655.  
  2656.   function init(config) {
  2657.     closeSetup();
  2658.     div = $create('div', {
  2659.       id: SETUP_ID,
  2660.       // prevent the main page from interpreting key presses in inputs as hotkeys
  2661.       // which may happen since it sees only the outer <div> in the event |target|
  2662.       contentEditable: true,
  2663.     });
  2664.     root = div.attachShadow({mode: 'open'});
  2665.     root.innerHTML = `
  2666. <style>
  2667.   :host {
  2668.     all: initial !important;
  2669.     position: fixed !important;
  2670.     z-index: 2147483647 !important;
  2671.     top: 20px !important;
  2672.     right: 20px !important;
  2673.     padding: 20px 30px !important;
  2674.     color: #000 !important;
  2675.     background: #eee !important;
  2676.     box-shadow: 5px 5px 25px 2px #000 !important;
  2677.     width: 500px !important;
  2678.     border: 1px solid black !important;
  2679.     display: flex !important;
  2680.     flex-direction: column !important;
  2681.   }
  2682.   main {
  2683.     font: 12px/15px sans-serif;
  2684.   }
  2685.   ul {
  2686.     max-height: calc(100vh - 200px);
  2687.     margin: 10px 0 15px 0;
  2688.     padding: 0;
  2689.     list-style: none;
  2690.   }
  2691.   li {
  2692.     margin: 0;
  2693.     padding: .25em 0;
  2694.   }
  2695.   li.options {
  2696.     display: flex;
  2697.     align-items: center;
  2698.     flex-wrap: wrap;
  2699.   }
  2700.   label {
  2701.     display: inline-flex;
  2702.     align-items: center;
  2703.   }
  2704.   label:not(:last-child) {
  2705.     margin-right: 1em;
  2706.   }
  2707.   label > :not(span) {
  2708.     margin-right: .25em;
  2709.   }
  2710.   label > :not(span):not(:first-child) {
  2711.     margin-left: .5em;
  2712.   }
  2713.   input:first-child {
  2714.     margin-left: 0;
  2715.   }
  2716.   input, select {
  2717.     min-height: 1.6em;
  2718.     box-sizing: border-box;
  2719.   }
  2720.   textarea {
  2721.     flex: 1;
  2722.     resize: vertical;
  2723.     margin: 1px 0;
  2724.     font: 11px/1.25 Consolas, monospace;
  2725.   }
  2726.   textarea:invalid {
  2727.     background-color: #f002;
  2728.     border-color: #800;
  2729.   }
  2730.   code {
  2731.     font-weight: bold;
  2732.   }
  2733.   a {
  2734.     text-decoration: none;
  2735.   }
  2736.   a:hover {
  2737.     text-decoration: underline;
  2738.   }
  2739.   button {
  2740.     padding: .2em 1em;
  2741.     margin: 0 1em;
  2742.   }
  2743.   .column {
  2744.     display: flex;
  2745.     flex-direction: column;
  2746.   }
  2747.   .highlight {
  2748.     animation: 2s fade-in cubic-bezier(0, .75, .25, 1);
  2749.     animation-fill-mode: both;
  2750.   }
  2751.   #rules textarea {
  2752.     word-break: break-all;
  2753.   }
  2754.   #x {
  2755.     position: absolute;
  2756.     top: 0;
  2757.     right: 0;
  2758.     padding: 4px 8px;
  2759.     cursor: pointer;
  2760.     user-select: none;
  2761.   }
  2762.   #x:hover {
  2763.     background-color: #8884;
  2764.   }
  2765.   @keyframes fade-in {
  2766.     from { background-color: deepskyblue }
  2767.     to {}
  2768.   }
  2769.   @media (prefers-color-scheme: dark) {
  2770.     :host {
  2771.       color: #aaa !important;
  2772.       background: #333 !important;
  2773.     }
  2774.     a {
  2775.       color: deepskyblue;
  2776.     }
  2777.     textarea, input, select {
  2778.       background: #111;
  2779.       color: #BBB;
  2780.       border-color: #555;
  2781.     }
  2782.     input[type="checkbox"] {
  2783.       filter: invert(1);
  2784.     }
  2785.   }
  2786. </style>
  2787. <main>
  2788.   <a href="${MPIV_BASE_URL}">${GM_info.script.name}</a>
  2789.   <div id=x>x</div>
  2790.   <ul class=column>
  2791.     <li class=options>
  2792.       <label>
  2793.         <span>Popup:</span>
  2794.         <select id=start>
  2795.           <option value=auto>automatically
  2796.           <option value=context>right click or ctrl
  2797.           <option value=ctrl>ctrl
  2798.         </select>
  2799.       </label>
  2800.       <label>
  2801.         <span>after</span>
  2802.         <input id=delay type=number min=0 max=10000 step=50 style="width: 4em">
  2803.         <span>ms</span>
  2804.       </label>
  2805.       <label>
  2806.         <input type=checkbox id=preload>
  2807.         <span>Start preloading immediately</span>
  2808.       </label>
  2809.     </li>
  2810.     <li class=options>
  2811.       <label>
  2812.         <span>Zoom:</span>
  2813.         <select id=zoom>
  2814.           <option value=context>right click or shift
  2815.           <option value=wheel>wheel up or shift
  2816.           <option value=shift>shift
  2817.           <option value=auto>automatically
  2818.         </select>
  2819.       </label>
  2820.       <label>
  2821.         <span>When zoomed out completely</span>
  2822.         <select id=zoomOut>
  2823.           <option value=stay>stay in zoom mode
  2824.           <option value=auto>stay if still hovered
  2825.           <option value=close>close popup
  2826.         </select>
  2827.       </label>
  2828.     </li>
  2829.     <li class=options>
  2830.       <label>
  2831.         <span>Only show popup over scaled-down image when natural size is</span>
  2832.         <input id=scale type=number min=1 max=100 step=.05 style="width: 4em;">
  2833.         <span>times larger</span>
  2834.       </label>
  2835.     </li>
  2836.     <li class=options>
  2837.       <label>
  2838.         <span>Custom scale factors:</span>
  2839.         <input id=scales style="width: 18em" placeholder="${Config.DEFAULTS.scales.join(' ')}">
  2840.         <span title="${`
  2841.           0 = fit to window
  2842.           0! = same as 0 but also removes smaller values
  2843.           * after value marks default zoom factor, for example: 1*
  2844.           Values smaller than non-zoomed size are ignored.
  2845.         `.trim().replace(/\n\s+/g, '\n')}" style="cursor:help">(?)</span>
  2846.       </label>
  2847.     </li>
  2848.     <li class=options>
  2849.       <label><input type=checkbox id=center><span>Always centered</span></label>
  2850.       <label><input type=checkbox id=imgtab><span>Run in image tabs</span></label>
  2851.       <label title="Disable only if you spoof the HTTP headers yourself">
  2852.         <input type=checkbox id=xhr>
  2853.         <span>Anti-hotlinking workaround</span>
  2854.       </label>
  2855.       <label>
  2856.         <input type=checkbox id=globalStatus>
  2857.         <span>Expose status on &lt;html&gt; node (note: may cause noticeable slowdown)</small>
  2858.       </label>
  2859.     </li>
  2860.     <li>
  2861.       <a href="${MPIV_BASE_URL}css.html">Custom CSS:</a>
  2862.       e.g. <code>#mpiv-popup.mpiv-show { animation: none }</code>
  2863.       <div class=column>
  2864.         <textarea id=css spellcheck=false></textarea>
  2865.       </div>
  2866.     </li>
  2867.     <li style="display: flex; justify-content: space-between;">
  2868.       <div><a href="${MPIV_BASE_URL}host_rules.html">Custom host rules:</a></div>
  2869.       <div style="white-space: nowrap">
  2870.         To disable, put any symbol except <code>a..z 0..9 - .</code><br>
  2871.         in "d" value, for example <code>"d": "!foo.com"</code>
  2872.       </div>
  2873.       <div>
  2874.         <input id=search type=search placeholder=Search style="width: 10em; margin-left: 1em">
  2875.       </div>
  2876.     </li>
  2877.     <li style="margin-left: -3px; margin-right: -3px; overflow-y: auto;
  2878.                padding-left: 3px; padding-right: 3px; ">
  2879.       <div id="rules" class="column">
  2880.         <textarea rows="1" spellcheck="false"></textarea>
  2881.       </div>
  2882.     </li>
  2883.     <li>
  2884.       <div hidden id=installLoading>Loading...</div>
  2885.       <div hidden id=installHint>Double-click the rule (or select and press Enter) to add it.
  2886.                                  Click OK when done.</div>
  2887.       <a href="${MPIV_BASE_URL}more_host_rules.html" id=install>Install rule from repository...</a>
  2888.     </li>
  2889.   </ul>
  2890.   <div style="text-align:center">
  2891.     <button id=ok accesskey=s>Save</button>
  2892.     <button id=apply accesskey=a>Apply</button>
  2893.     <button id=import style="margin-right: 0">Import</button>
  2894.     <button id=export style="margin-left: 0">Export</button>
  2895.     <button id=cancel>Cancel</button>
  2896.     <div id=exportNotification hidden style="color: green; font-weight: bold;
  2897.       position: absolute; bottom: 2px; left: 0; right: 0;">Copied to clipboard.</div>
  2898.   </div>
  2899. </main>
  2900.     `;
  2901.     // rules
  2902.     const rules = UI.rules;
  2903.     rules.addEventListener('input', checkRule);
  2904.     rules.addEventListener('focusin', focusRule);
  2905.     rules.addEventListener('paste', focusRule);
  2906.     blankRuleElement =
  2907.       setup.blankRuleElement =
  2908.         setup.blankRuleElement || rules.firstElementChild.cloneNode();
  2909.     for (const rule of config.hosts || []) {
  2910.       const el = blankRuleElement.cloneNode();
  2911.       el.value = typeof rule === 'string' ? rule : Ruler.format(rule);
  2912.       rules.appendChild(el);
  2913.       checkRule({target: el});
  2914.     }
  2915.     // search rules
  2916.     const search = UI.search;
  2917.     search.oninput = () => {
  2918.       setup.search = search.value;
  2919.       const s = search.value.toLowerCase();
  2920.       for (const el of rules.children)
  2921.         el.hidden = s && !el.value.toLowerCase().includes(s);
  2922.     };
  2923.     search.value = setup.search || '';
  2924.     if (search.value)
  2925.       search.oninput();
  2926.     // prevent the main page from interpreting key presses in inputs as hotkeys
  2927.     // which may happen since it sees only the outer <div> in the event |target|
  2928.     root.addEventListener('keydown', e =>
  2929.       !e.altKey && !e.ctrlKey && !e.metaKey && e.stopPropagation(), true);
  2930.     UI.apply.onclick = UI.cancel.onclick = UI.ok.onclick = UI.x.onclick = closeSetup;
  2931.     UI.css.value = config.css;
  2932.     UI.delay.value = config.delay;
  2933.     UI.export.onclick = exportSettings;
  2934.     UI.import.onclick = importSettings;
  2935.     UI.install.onclick = setupRuleInstaller;
  2936.     UI.scale.value = config.scale;
  2937.     UI.scales.value = config.scales.join(' ');
  2938.     UI.start.value = config.start;
  2939.     UI.start.onchange = function () {
  2940.       UI.delay.closest('label').hidden =
  2941.         UI.preload.closest('label').hidden =
  2942.           this.value !== 'auto';
  2943.     };
  2944.     UI.start.onchange();
  2945.     UI.xhr.onclick = ({target: el}) => el.checked || confirm($propUp(el, 'title'));
  2946.     UI.zoom.value = config.zoom;
  2947.     UI.zoomOut.value = config.zoomOut;
  2948.     for (const el of $$('[type="checkbox"]', root))
  2949.       el.checked = config[el.id];
  2950.     for (const el of $$('a[href^="http"]', root)) {
  2951.       el.target = '_blank';
  2952.       el.rel = 'noreferrer noopener external';
  2953.     }
  2954.     doc.body.appendChild(div);
  2955.     requestAnimationFrame(() => {
  2956.       UI.css.style.minHeight = clamp(UI.css.scrollHeight, 40, div.clientHeight / 4) + 'px';
  2957.     });
  2958.   }
  2959. }
  2960.  
  2961. async function setupRuleInstaller(e) {
  2962.   dropEvent(e);
  2963.   const parent = this.parentElement;
  2964.   parent.children.installLoading.hidden = false;
  2965.   this.remove();
  2966.   let rules;
  2967.  
  2968.   try {
  2969.     rules = extractRules((await Remoting.getDoc(this.href)).doc);
  2970.     const selector = $create('select', {
  2971.       size: 8,
  2972.       style: 'width: 100%',
  2973.       ondblclick: e => e.target !== selector && maybeSetup(e),
  2974.       onkeyup: e => e.key === 'Enter' && maybeSetup(e),
  2975.     });
  2976.     selector.append(...rules.map(renderRule));
  2977.     selector.selectedIndex = findMatchingRuleIndex();
  2978.     // remove "name" since the installed rules don't need it
  2979.     for (const r of rules)
  2980.       delete r.name;
  2981.     parent.children.installLoading.remove();
  2982.     parent.children.installHint.hidden = false;
  2983.     parent.appendChild(selector);
  2984.   } catch (e) {
  2985.     parent.textContent = 'Error loading rules: ' + (e.message || e);
  2986.   }
  2987.  
  2988.   function extractRules(doc) {
  2989.     const code = $('script', doc).textContent;
  2990.     // sort by name
  2991.     return JSON.parse(code.match(/var\s+rules\s*=\s*(\[.+]);?[\r\n]/)[1])
  2992.       .filter(r => !r.d || hostname.includes(r.d))
  2993.       .sort((a, b) =>
  2994.         (a = a.name.toLowerCase()) < (b = b.name.toLowerCase()) ? -1 :
  2995.           a > b ? 1 :
  2996.             0);
  2997.   }
  2998.  
  2999.   function findMatchingRuleIndex() {
  3000.     // get the core part of the current domain that's not "www", "m", etc.
  3001.     const h = hostname.split('.');
  3002.     const core = h[0] === 'www' || h.length > 2 && h[0].length === 1 ? h[1] : h[0];
  3003.     // find a rule matching the domain core
  3004.     return rules.findIndex(r =>
  3005.       r.name.toLowerCase().includes(core) ||
  3006.       r.d && hostname.includes(r.d));
  3007.   }
  3008.  
  3009.   function renderRule(r) {
  3010.     const {name, ...copy} = r;
  3011.     return $create('option', {
  3012.       textContent: name,
  3013.       title: Ruler.format(copy, {expand: true})
  3014.         .replace(/^{|\s*}$/g, '')
  3015.         .split('\n')
  3016.         .slice(0, 12)
  3017.         .map(renderTitleLine)
  3018.         .filter(Boolean)
  3019.         .join('\n'),
  3020.     });
  3021.   }
  3022.  
  3023.   function renderTitleLine(line, i, arr) {
  3024.     return (
  3025.       // show ... on 10th line if there are more lines
  3026.       i === 9 && arr.length > 10 ? '...' :
  3027.         i > 10 ? '' :
  3028.           // truncate to 100 chars
  3029.           (line.length > 100 ? line.slice(0, 100) + '...' : line)
  3030.             // strip the leading space
  3031.             .replace(/^\s/, ''));
  3032.   }
  3033.  
  3034.   function maybeSetup(e) {
  3035.     if (!e.altKey && !e.ctrlKey && !e.shiftKey && !e.metaKey)
  3036.       setup({rule: rules[e.currentTarget.selectedIndex]});
  3037.   }
  3038. }
  3039.  
  3040. App.init();