Clear user defined TeX macros from global state

Author: rianmcguire

lib/main.js

@@ -741,6 +741,13 @@ function GetState(state) {
     MML.SUPER.ID = ID = 0;
     MathJax.OutputJax.CommonHTML.ID = 0;
   }
+
+  // Clear any existing user defined macros
+  Object.keys(TEX.Definitions.macros).forEach(function(macroName){
+    if (TEX.Definitions.macros[macroName].isUser) {
+      delete TEX.Definitions.macros[macroName];
+    }
+  });
 }
 
 //

test/macro-state.js

@@ -0,0 +1,23 @@
+var tape = require('tape');
+var mjAPI = require("../lib/main.js");
+
+tape('macros should be cleared from global state', function(t) {
+  t.plan(2);
+  mjAPI.start();
+
+  mjAPI.typeset({
+    math: "\\def\\mymacro{2\\pi} \\mymacro",
+    format: "TeX",
+    mml: true
+  }, function(data) {
+    t.false(data.errors, 'Defined and used macro');
+  });
+
+  mjAPI.typeset({
+    math: "\\mymacro",
+    format: "TeX",
+    mml: true
+  }, function(data) {
+    t.true(data.errors, '\\mymacro should no longer be defined');
+  });
+});