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numbas-mathjax.js

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+/**
+ * An extension to MathJax which adds \var and \simplify commands.
+ */
+
+
+(function() {
+
+var NumbasMap = new MathJax._.input.tex.SymbolMap.CommandMap(
+  'numbasMap', 
+  
+  {
+    var: ['numbasVar', 'var'],
+    simplify: ['numbasToken', 'simplify']
+  }, 
+  
+  { 
+    numbasVar: function mmlToken(parser, name, type) {
+      const {jme} = Numbas;
+      
+      try {
+        const settings_string = parser.GetBrackets(name); // The optional argument to the command, in square brackets.
+        
+        const settings = {};
+        if(settings_string!==undefined) {
+            settings_string.split(/\s*,\s*/g).forEach(function(v) {
+                var setting = jme.normaliseRulesetName(v.trim());
+                settings[setting] = true;
+            });
+        }
+        
+        const expr = parser.GetArgument(name);
+        
+        const {scope} = parser.configuration.packageData.get('numbas');
+  
+        const tok = jme.evaluate(expr, scope);
+        const tex = jme.display.texify({tok}, settings, scope);
+        const mml = new MathJax._.input.tex.TexParser.default(tex, parser.stack.env, parser.configuration).mml();
+  
+        parser.Push(mml);
+      } catch(e) {
+        console.error(e);
+        throw(new Numbas.Error('mathjax.math processing error',{message:e.message,expression:expr}));
+      }
+
+    }
+  }
+);
+
+function saveJMEScope(arg) {
+  const scope = Numbas.display.find_jme_scope(arg.math.start.node);
+  arg.data.packageData.set('numbas',{scope});
+}
+
+
+var NumbasConfiguration = MathJax._.input.tex.Configuration.Configuration.create('numbas', {
+  handler: {
+    macro: ['numbasMap']
+  },
+  preprocessors: [
+    [saveJMEScope, 1]
+  ],  
+});
+
+})();