/************************************************************* * * latest.js * * Replacement for cdn.mathjax.org/mathjax/latest that loads the * latest (2.x) version of MathJax from cdnjs, rawgit.com, or jsdelivr * depending on where it was loaded from. * * --------------------------------------------------------------------- * * Copyright (c) 2017 The MathJax Consortium * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ (function () { var CDN = { 'cdnjs.cloudflare.com': { api: 'https://api.cdnjs.com/libraries/mathjax?fields=version', version: 'version', mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/' }, 'cdn.rawgit.com': { api: 'https://api.github.com/repos/mathjax/mathjax/releases/latest', version: 'tag_name', mathjax: 'https://cdn.rawgit.com/mathjax/MathJax/' }, 'cdn.jsdelivr.net': { api: 'https://api.jsdelivr.com/v1/jsdelivr/libraries?name=mathjax&lastversion=*', version: 'lastversion', mathjax: 'https://cdn.jsdelivr.net/mathjax/' } }; function Error(message) { if (console && console.log) console.log(message); } function getScript() { if (document.currentScript) return document.currentScript; var scripts = document.getElementsByTagName("script"); for (var i = 0, m = scripts.length; i < m; i++) { var script = scripts[i]; for (var cdn in CDN) {if (CDN.hasOwnProperty(cdn)) { var url = CDN[cdn].mathjax; if (script.src && script.src.substr(0,url.length) === url) return script; }} } } function getCDN(script) { if (!script) return; var cdn = script.src.replace(/https:\/\//,'').replace(/[\/\?].*/,''); return CDN[cdn]; } var cookiePattern = /(?:^|;\s*)mjx\.latest=([^;]*)(?:;|$)/; function getVersion() { var match; try {match = cookiePattern.exec(document.cookie)} catch (err) {} if (match && match[1] !== '') return match[1]; } function setVersion(version) { cookie = 'mjx.latest=' + version; var time = new Date(); time.setDate(time.getDate() + 7); cookie += '; expires=' + time.toGMTString(); cookie += '; path=/'; try {document.cookie = cookie} catch (err) {} } function getXMLHttpRequest() { if (window.XMLHttpRequest) return new XMLHttpRequest(); if (window.ActiveXObject) { try {return new ActiveXObject("Msxml2.XMLHTTP")} catch (err) {} try {return new ActiveXObject("Microsoft.XMLHTTP")} catch (err) {} } } function loadMathJax(url) { var script = document.createElement('script'); script.type = 'text/javascript'; script.async = true; script.src = url; var head = document.head || document.getElementsByTagName('head')[0] || document.body; if (head) { head.appendChild(script); } else { Error("Can't find the document element"); } } function loadDefaultMathJax() { var script = getScript(); if (script) { loadMathJax(script.src.replace(/\/latest\.js/, "/MathJax.js")); } else { Error("Can't determine the URL for loading MathJax"); } } function getLatestMathJax(cdn,config,unpacked) { var request = getXMLHttpRequest(); if (request) { request.onreadystatechange = function() { if (request.readyState === 4) { if (request.status === 200) { var json = JSON.parse(request.responseText); if (json instanceof Array) json = json[0]; var version = json[cdn.version]; if (version.substr(0,2) === '2.') { setVersion(version); loadMathJax(cdn.mathjax + json[cdn.version] + unpacked + '/MathJax.js' + config); return; } } else { Error("Problem aquiring MathJax version: status = " + request.status); } loadDefaultMathJax(); } } request.open('GET', cdn.api, true); request.send(null); } else { Error("Can't create XMLHttpRequest object"); loadDefaultMathJax(); } } var script = getScript(); var cdn = getCDN(script); if (cdn) { var config = script.src.replace(/.*?(\?|$)/, "$1"); config += (config ? '&' : '?') + 'latest'; var unpacked = (script.src.match(/\/unpacked\/latest\.js/) ? "/unpacked" : ""); var version = getVersion(); if (version) { loadMathJax(cdn.mathjax + version + unpacked + '/MathJax.js' + config); } else { getLatestMathJax(cdn, config, unpacked); } } else { loadDefaultMathJax(); } })();