// ==UserScript==// @name         Style shadowDOM// @namespace    https://github.com/Procyon-b// @version      0.2.2// @description  Allow stylus to target elements in shadow-root// @author       Achernar// @match        http://NOTHING/// @run-at       document-start// @grant        none// ==/UserScript==(function() {"use strict";var id=Date.now()// patch attachShadow()var AS=HTMLElement.prototype.attachShadow;// bail out if no functionif (!AS) return;HTMLElement.prototype.attachShadow=function(m){/*[native */var e=this;e.sr=AS.apply(e,arguments)shadows.push(e.sr);inject(e.sr);shadowMod(e.sr);return e.sr;}// END patchvar sheets={}, order=[],shadows=[], sCSS={}, injCSS='', oldInjCSS='';// catch stylus injectionsconst obs=new MutationObserver(function(muts){for (let mut of muts) {for (let n of mut.addedNodes) {if ( (n.tagName == 'STYLE') && (( (n.className == 'stylus') && n.id.startsWith('stylus-') ) ||( n.className.startsWith('stylish') && n.id.startsWith('stylish-') ) ||( (n.className == 'xstyle') && n.id.startsWith('xstyle-') ))) {addCSS(n);}}for (let n of mut.removedNodes) {if ( (n.tagName == 'STYLE') && (( (n.className == 'stylus') && n.id.startsWith('stylus-') ) ||( n.className.startsWith('stylish') && n.id.startsWith('stylish-') ) ||( (n.className == 'xstyle') && n.id.startsWith('xstyle-') ))) {remCSS(n);}}}});// END catchfunction init() {// find open shadows if userscript is ran after page load.function findShadows(r) {let a=r.querySelectorAll('*');for (let s, i=0; i < a.length; i++) {if (s=a[i].shadowRoot) {shadows.push(s);shadowMod(s)findShadows(s);}}}if (document.readyState == 'complete') findShadows(document);// END findShadowsif (!document.documentElement) {setTimeout(init, 0);return;}obs.observe(document.documentElement, {attributes: false, subtree: false, childList: true });// check for stylesheetsdocument.documentElement.querySelectorAll('style[id^="stylus-"].stylus, style[id^="stylish-"][class^="stylish"], style[id^="xstyle-"].xstyle, head style[data-source^="User Java"]').forEach( (e) => addCSS(e,2) );window.addEventListener('load', function(){document.documentElement.querySelectorAll('head style[data-source^="User Java"]').forEach( (e) => addCSS(e,3) );});}init();// get only shadow-specific cssfunction parseSheet(s) {var R=s.sheet.cssRules, sels, sel, shCSS='';for (let i=0; i < R.length; i++) {sel=R[i].selectorText;if (!sel || !sel.includes(':host')) continue;sels=sel.split(',').filter(function(v){ return v.includes(':host') }).join(',');shCSS+=sels.trim()+ R[i].cssText.substr(sel.length)+'\n';}if (shCSS) shCSS='/*'+s.id+'*/\n'+shCSS;return shCSS;}// inject in this shadowfunction inject(e) {if (injCSS == '') {if (e._inj_) {e._inj_.remove();delete e._inj_;}return;}if (!e._inj_ || !e._inj_.parentNode ) {let s=e._inj_=document.createElement('style');s.className='sh-stylus';e.appendChild(s);}e._inj_.textContent=injCSS;}// inject stylefunction injectAll() {for (let i=0; i < shadows.length; i++) inject(shadows[i]);}// create & inject style in shadowsfunction injUpd() {oldInjCSS=injCSS;injCSS='';for (let i=0; i < order.length; i++) injCSS+=sCSS[order[i]];if (injCSS !== oldInjCSS) injectAll();}// get stylus stylesheet orderfunction getStylusOrder() {order=[];for (let i=0; i < document.styleSheets.length; i++) {let s=document.styleSheets[i].ownerNode;if (s.nodeName != 'STYLE') continue;if ( (s.className == 'stylus') || (s.className.startsWith('stylish')) || (s.className == 'xstyle') ||(s.dataset.source && s.dataset.source.startsWith('User Java')))order.push(s.id);}}// handle new stylesheetfunction addCSS(n, k=1) {if (!n.id) n.id=Math.random();if (n.id in sheets) return;sheets[n.id]=n;if (n.__k__) ;else {n.__k__=k;// monitor modification STYLE elementconst obs=new MutationObserver(function(muts){if (muts[0].addedNodes.length) {sCSS[muts[0].target.id]=parseSheet(muts[0].target);injUpd();}});obs.observe(n, {attributes: false, subtree: false, childList: true });// monitor modification text nodeconst obs2=new MutationObserver(function(muts){if (muts[0].type == 'characterData') {// === reparse stylesheet and reinject itlet e=muts[0].target.parentNode;sCSS[e.id]=parseSheet(e);injUpd();}});obs2.observe(n, {characterData: true, attributes: false, childList: false, subtree: true});}sCSS[n.id]=parseSheet(n);getStylusOrder();injUpd();}// handle stylesheet removalfunction remCSS(n) {// is it only moved?if (n.parentNode == null) delete sheets[n.id];getStylusOrder();injUpd();}// monitor shadow modificationfunction shadowMod(e) {const obs=new MutationObserver(function(muts){if (e._inj_ && (!e._inj_.parentNode || e._inj_.nextElementSibling) ) e.appendChild(e._inj_);});obs.observe(e, {attributes: false, subtree: false, childList: true });}})();