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get("https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.7.1/katex.min.js", function (t) { eval('"use strict";' + t); //alert(window.katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}")); //alert(katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}")); processSubTree(document.body); beginWatch(); }); var mpattern = /(\$\$\$?)([^\$]+?)\1/g; function queryTextNodes(documentNode) { var snapshot = document.evaluate('//text()[contains(.,"$$")]', documentNode, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null); var nodes = []; for (var i = 0; i < snapshot.snapshotLength; i++) { nodes.push(snapshot.snapshotItem(i)); } return nodes; } function createMathSpan(s) { var m; var lastIndex = 0; var idx = 0; var span = document.createElement("span"); while (true) { m = mpattern.exec(s); if (!m) break; idx = m.index; if (idx > lastIndex) span.appendChild(document.createTextNode(s.substring(lastIndex, idx))); var mathBlock = document.createElement("span"); try { katex.render(m[2], mathBlock, { displayMode : (m[1] == "$$$") ? true : false, throwOnError : false }); } catch (exc) { mathBlock.appendChild(errSpan(exc)); } span.appendChild(mathBlock); //span.appendChild(document.createElement("span")).textContent=m[2]; lastIndex = idx + m[0].length; } if (lastIndex < s.length) span.appendChild(document.createTextNode(s.substring(lastIndex))); return span; } function process(tnode) { if (!tnode.parentElement) return; tnode.replaceWith(createMathSpan(tnode.textContent)); } function processSubTree(node) { for (var tn of queryTextNodes(node)) //try{ process(tn); //} //catch(exc) //{ // notie.alert(3, exc, 4); //} } var matchIds = ["u_json"]; var matchClasses = ["UFIComment", "_3b-9", "_5pcb", "_4tdt", "_o46", "mbm"]; //var showElem=false; var streamWatcher = new MutationObserver(function (mutations, self) { for (var m of mutations) if (m.type == "childList") for (var el of m.addedNodes) { //console.log("original", el); //if(showElem) // console.log("elem", el); if (el.nodeType != document.ELEMENT_NODE) continue; var found = false; if (el.hasAttribute("id")) for (var mtid of matchIds) if (el.getAttribute("id").startsWith(mtid)) { found = true; break; } if (!found) for (var mtcl of matchClasses) if (el.classList.contains(mtcl)) { found = true; break; } if (found) { processSubTree(el); //console.log(el); } } }); function beginWatch() { //for(var n of document.querySelectorAll("div[id^=feed_stream]>div[id^=more]>div[id^=u_ps]")) streamWatcher.observe(document.body, { childList : true, subtree : true }); document.body.addEventListener('dblclick', function (evt) { // //evt.stopPropagation(); processSubTree(document.body); }); }