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+// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7dn=apache-2.0.txt Apache-2.0
+/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+
+/*************************************************************
+ *
+ *  MathJax/extensions/TeX/enclose.js
+ *  
+ *  Implements the \enclose macros, which give access from TeX to the
+ *  <menclose> tag in the MathML that underlies MathJax's internal format.
+ *  
+ *  Usage:
+ *  
+ *      \enclose{notation}{math}                  % enclose math using given notation
+ *      \enclose{notation,notation,...}{math}     % enclose with several notations
+ *      \enclose{notation}[attributes]{math}      % enclose with attributes
+ *  
+ *  ---------------------------------------------------------------------
+ *  
+ *  Copyright (c) 2011-2020 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.
+ */
+
+MathJax.Extension["TeX/enclose"] = {
+  version: "2.7.9",
+  
+  //
+  //  The attributes allowed in \enclose{notation}[attributes]{math}
+  //
+  ALLOWED: {
+    arrow: 1,
+    color: 1, mathcolor: 1,
+    background: 1, mathbackground: 1,
+    padding: 1,
+    thickness: 1
+  }
+};
+  
+MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
+  var TEX = MathJax.InputJax.TeX,
+      MML = MathJax.ElementJax.mml,
+      ALLOW = MathJax.Extension["TeX/enclose"].ALLOWED;
+  
+  //
+  //  Set up macro
+  //
+  TEX.Definitions.Add({macros: {enclose: 'Enclose'}},null,true);
+
+  TEX.Parse.Augment({
+    //
+    //  Implement \enclose{notation}[attr]{math}
+    //    (create <menclose notation="notation">math</menclose>)
+    //
+    Enclose: function(name) {
+      var notation = this.GetArgument(name),
+          attr = this.GetBrackets(name),
+          math = this.ParseArg(name);
+      var def = {notation: notation.replace(/,/g," ")};
+      if (attr) {
+        attr = attr.replace(/ /g,"").split(/,/);
+        for (var i = 0, m = attr.length; i < m; i++) {
+          var keyvalue = attr[i].split(/[:=]/);
+          if (ALLOW[keyvalue[0]]) {
+            keyvalue[1] = keyvalue[1].replace(/^"(.*)"$/,"$1");
+            if (keyvalue[1] === "true") {keyvalue[1] = true}
+            if (keyvalue[1] === "false") {keyvalue[1] = false}
+            if (keyvalue[0] === "arrow" && keyvalue[1])
+              {def.notation = def.notation + " updiagonalarrow"} else
+              {def[keyvalue[0]] = keyvalue[1]}
+          }
+        }
+      }
+      this.Push(MML.menclose(math).With(def));
+    }
+  });
+
+  MathJax.Hub.Startup.signal.Post("TeX enclose Ready");
+  
+});
+
+MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/enclose.js");
+// @license-end