mirror of https://gitee.com/openkylin/mathjax.git
160 lines
5.1 KiB
JavaScript
160 lines
5.1 KiB
JavaScript
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/*************************************************************
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*
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* latest.js
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*
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* Replacement for cdn.mathjax.org/mathjax/latest that loads the
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* latest (2.x) version of MathJax from cdnjs, rawgit.com, or jsdelivr
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* depending on where it was loaded from.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2017-2018 The MathJax Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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(function () {
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var CDN = {
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'cdnjs.cloudflare.com': {
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api: 'https://api.cdnjs.com/libraries/mathjax?fields=version',
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version: 'version',
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mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/'
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},
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'cdn.rawgit.com': {
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api: 'https://api.github.com/repos/mathjax/mathjax/releases/latest',
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version: 'tag_name',
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mathjax: 'https://cdn.rawgit.com/mathjax/MathJax/'
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},
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'cdn.jsdelivr.net': {
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api: 'https://api.jsdelivr.com/v1/jsdelivr/libraries?name=mathjax&lastversion=*',
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version: 'lastversion',
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mathjax: 'https://cdn.jsdelivr.net/mathjax/'
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}
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};
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function Error(message) {
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if (console && console.log) console.log(message);
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}
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function getScript() {
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if (document.currentScript) return document.currentScript;
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var scripts = document.getElementsByTagName("script");
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for (var i = 0, m = scripts.length; i < m; i++) {
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var script = scripts[i];
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for (var cdn in CDN) {if (CDN.hasOwnProperty(cdn)) {
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var url = CDN[cdn].mathjax;
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if (script.src && script.src.substr(0,url.length) === url) return script;
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}}
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}
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}
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function getCDN(script) {
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if (!script) return;
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var cdn = script.src.replace(/https:\/\//,'').replace(/[\/\?].*/,'');
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return CDN[cdn];
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}
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var cookiePattern = /(?:^|;\s*)mjx\.latest=([^;]*)(?:;|$)/;
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function getVersion() {
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var match;
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try {match = cookiePattern.exec(document.cookie)} catch (err) {}
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if (match && match[1] !== '') return match[1];
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}
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function setVersion(version) {
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cookie = 'mjx.latest=' + version;
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var time = new Date();
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time.setDate(time.getDate() + 7);
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cookie += '; expires=' + time.toGMTString();
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cookie += '; path=/';
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try {document.cookie = cookie} catch (err) {}
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}
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function getXMLHttpRequest() {
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if (window.XMLHttpRequest) return new XMLHttpRequest();
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if (window.ActiveXObject) {
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try {return new ActiveXObject("Msxml2.XMLHTTP")} catch (err) {}
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try {return new ActiveXObject("Microsoft.XMLHTTP")} catch (err) {}
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}
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}
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function loadMathJax(url) {
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var script = document.createElement('script');
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script.type = 'text/javascript';
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script.async = true;
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script.src = url;
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var head = document.head || document.getElementsByTagName('head')[0] || document.body;
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if (head) {
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head.appendChild(script);
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} else {
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Error("Can't find the document <head> element");
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}
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}
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function loadDefaultMathJax() {
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var script = getScript();
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if (script) {
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loadMathJax(script.src.replace(/\/latest\.js/, "/MathJax.js"));
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} else {
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Error("Can't determine the URL for loading MathJax");
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}
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}
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function getLatestMathJax(cdn,config,unpacked) {
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var request = getXMLHttpRequest();
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if (request) {
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request.onreadystatechange = function() {
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if (request.readyState === 4) {
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if (request.status === 200) {
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var json = JSON.parse(request.responseText);
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if (json instanceof Array) json = json[0];
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var version = json[cdn.version];
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if (version.substr(0,2) === '2.') {
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setVersion(version);
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loadMathJax(cdn.mathjax + json[cdn.version] + unpacked + '/MathJax.js' + config);
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return;
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}
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} else {
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Error("Problem acquiring MathJax version: status = " + request.status);
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}
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loadDefaultMathJax();
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}
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}
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request.open('GET', cdn.api, true);
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request.send(null);
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} else {
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Error("Can't create XMLHttpRequest object");
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loadDefaultMathJax();
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}
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}
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var script = getScript();
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var cdn = getCDN(script);
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if (cdn) {
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var config = script.src.replace(/.*?(\?|$)/, "$1");
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config += (config ? '&' : '?') + 'latest';
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var unpacked = (script.src.match(/\/unpacked\/latest\.js/) ? "/unpacked" : "");
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var version = getVersion();
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if (version) {
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loadMathJax(cdn.mathjax + version + unpacked + '/MathJax.js' + config);
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} else {
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getLatestMathJax(cdn, config, unpacked);
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}
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} else {
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loadDefaultMathJax();
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}
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})();
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