Add semantics annotation to NativeMML output. This is done in the NativeMML output jax rather than the input jax so that it can be done for any input format (that provides an encoding for it). Also, it avoids having the Show As MathML output include the annotation. Resolves issue #814.

Author: dpvc

unpacked/jax/input/AsciiMath/jax.js

@@ -1276,6 +1276,7 @@ junk = null;
 
   ASCIIMATH.Augment({
     sourceMenuTitle: /*_(MathMenu)*/ ["AsciiMathInput","AsciiMath Input"],
+    annotationEncoding: "text/x-asciimath",
 
     prefilterHooks:    MathJax.Callback.Hooks(true),   // hooks to run before processing AsciiMath
     postfilterHooks:   MathJax.Callback.Hooks(true),   // hooks to run after processing AsciiMath

unpacked/jax/input/TeX/jax.js

@@ -2061,6 +2061,7 @@
     },
 
     sourceMenuTitle: /*_(MathMenu)*/ ["TeXCommands","TeX Commands"],
+    annotationEncoding: "application/x-tex",
 
     prefilterHooks: MathJax.Callback.Hooks(true),    // hooks to run before processing TeX
     postfilterHooks: MathJax.Callback.Hooks(true),   // hooks to run after processing TeX
@@ -2087,7 +2088,6 @@
       this.prefilterHooks.Execute(data); math = data.math;
       try {
         mml = TEX.Parse(math).mml();
-//        mml = MML.semantics(mml,MML.annotation(math).With({encoding:"application/x-tex"}));
       } catch(err) {
         if (!err.texError) {throw err}
         mml = this.formatError(err,math,display,script);

unpacked/jax/output/NativeMML/jax.js

@@ -299,7 +299,7 @@
       //
       //  Convert to MathML (if restarted, remove any partial math)
       //
-      try {math.toNativeMML(mspan)} catch (err) {
+      try {math.toNativeMML(mspan,jax)} catch (err) {
         if (err.restart) {while (mspan.firstChild) {mspan.removeChild(mspan.firstChild)}}
         throw err;
       }
@@ -906,8 +906,9 @@
     }
 
     MML.math.Augment({
-      toNativeMML: function (parent) {
-        var tag = this.NativeMMLelement(this.type), math = tag, jax;
+      toNativeMML: function (parent,jax) {
+        var tag = this.NativeMMLelement(this.type), math = tag;
+        var annotate = (jax ? MathJax.InputJax[jax.inputJax].annotationEncoding : null);
         var i, m;
         nMML.adjustWidths = [];
         //
@@ -921,6 +922,17 @@
         //
         if (nMML.widthBug) {tag = tag.appendChild(this.NativeMMLelement("mrow"))}
         //
+        //  Addannotation if the input jax provides an annotation encoding
+        //
+        if (annotate) {
+          tag = tag.appendChild(this.NativeMMLelement("semantics"))
+          tag.appendChild(this.NativeMMLelement("mrow"));
+          var annotation = tag.appendChild(this.NativeMMLelement("annotation"));
+          annotation.appendChild(document.createTextNode(jax.originalText));
+          annotation.setAttribute("encoding",annotate);
+          tag = tag.firstChild; // mrow
+        }
+        //
         //  Add the children
         //
         for (i = 0, m = this.data.length; i < m; i++) {
@@ -966,7 +978,6 @@
           //
           //  Save size for later when we check if Web fonts have arrived
           //
-          jax = HUB.getJaxFor(parent);
           if (jax) {jax.NativeMML.scrollWidth = math.firstChild.scrollWidth}
         }
         if (nMML.adjustWidths.length) {