From f0c0c6386ef298a42ec433d390300a0f023421fc Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Sat, 16 Aug 2014 12:58:51 -0400
Subject: [PATCH] Properly handle callbacks returned by pre- and postfilter
 hooks.

---
 unpacked/jax/input/AsciiMath/jax.js | 7 ++++---
 unpacked/jax/input/MathML/jax.js    | 9 +++++----
 unpacked/jax/input/TeX/jax.js       | 7 ++++---
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/unpacked/jax/input/AsciiMath/jax.js b/unpacked/jax/input/AsciiMath/jax.js
index bbbf2c88d..46b69c052 100644
--- a/unpacked/jax/input/AsciiMath/jax.js
+++ b/unpacked/jax/input/AsciiMath/jax.js
@@ -1284,15 +1284,16 @@ junk = null;
     Translate: function (script) {
       var mml, math = MathJax.HTML.getScript(script);
       var data = {math:math, script:script};
-      this.prefilterHooks.Execute(data); math = data.math;
+      var callback = this.prefilterHooks.Execute(data); if (callback) return callback;
+      math = data.math;
       try {
         mml = this.AM.parseMath(math);
       } catch(err) {
         if (!err.asciimathError) {throw err}
         mml = this.formatError(err,math);
       }
-      data.math = MML(mml); this.postfilterHooks.Execute(data);
-      return data.math;
+      data.math = MML(mml);
+      return this.postfilterHooks.Execute(data) || data.math;
     },
     formatError: function (err,math,script) {
       var message = err.message.replace(/\n.*/,"");
diff --git a/unpacked/jax/input/MathML/jax.js b/unpacked/jax/input/MathML/jax.js
index 7aaf5ac84..9807a3622 100644
--- a/unpacked/jax/input/MathML/jax.js
+++ b/unpacked/jax/input/MathML/jax.js
@@ -247,20 +247,21 @@
       if (script.firstChild &&
           script.firstChild.nodeName.toLowerCase().replace(/^[a-z]+:/,"") === "math") {
         data.math = script.firstChild;
-        this.prefilterHooks.Execute(data); math = data.math;
       } else {
         math = MathJax.HTML.getScript(script);
         if (BROWSER.isMSIE) {math = math.replace(/(&nbsp;)+$/,"")}
-        data.math = math; this.prefilterHooks.Execute(data); math = data.math;
+        data.math = math;
       }
+      var callback = this.prefilterHooks.Execute(data); if (callback) return callback;
+      math = data.math;
       try {
         mml = MATHML.Parse(math).mml;
       } catch(err) {
         if (!err.mathmlError) {throw err}
         mml = this.formatError(err,math,script);
       }
-      data.math = MML(mml); this.postfilterHooks.Execute(data);
-      return data.math;
+      data.math = MML(mml);
+      return this.postfilterHooks.Execute(data) || data.math;
     },
     prefilterMath: function (math,script) {return math},
     prefilterMathML: function (math,script) {return math},
diff --git a/unpacked/jax/input/TeX/jax.js b/unpacked/jax/input/TeX/jax.js
index 2c8166f54..e2000ded2 100644
--- a/unpacked/jax/input/TeX/jax.js
+++ b/unpacked/jax/input/TeX/jax.js
@@ -2086,7 +2086,8 @@
       var mml, isError = false, math = MathJax.HTML.getScript(script);
       var display = (script.type.replace(/\n/g," ").match(/(;|\s|\n)mode\s*=\s*display(;|\s|\n|$)/) != null);
       var data = {math:math, display:display, script:script};
-      this.prefilterHooks.Execute(data); math = data.math;
+      var callback = this.prefilterHooks.Execute(data); if (callback) return callback;
+      math = data.math;
       try {
         mml = TEX.Parse(math).mml();
       } catch(err) {
@@ -2097,8 +2098,8 @@
       if (mml.inferred) {mml = MML.apply(MathJax.ElementJax,mml.data)} else {mml = MML(mml)}
       if (display) {mml.root.display = "block"}
       if (isError) {mml.texError = true}
-      data.math = mml; this.postfilterHooks.Execute(data);
-      return data.math;
+      data.math = mml; 
+      return this.postfilterHooks.Execute(data) || data.math;
     },
     prefilterMath: function (math,displaystyle,script) {
       return math;