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First draft of assistive MathML extension. Still needs configuration, and we need to make sure the mml2jax exteion doesn't try to process the hidden MathML.

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Davide P. Cervone 2015-07-23 11:33:07 -04:00
parent 24f0388bda
commit f3273f6e62
1 changed files with 109 additions and 0 deletions
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/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/*************************************************************
*
* MathJax/extensions/AssistiveMML.js
*
* Implements an extension that inserts hidden MathML into the
* page for screen readers or other asistive technology.
*
* ---------------------------------------------------------------------
*
* Copyright (c) 2015 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.
*/
(function (AJAX,CALLBACK,HUB,HTML) {
var AssistiveMML = MathJax.Extension["AssistiveMML"] = {
version: "2.6",
//
// For each jax in the state, look up the frame.
// If the jax doesn't use NativeMML and hasn't already been handled:
// Get the MathML for the jax, taking resets into account.
// Add a data-mathml attribute to the frame, and
// Create a span that is not visible on screen and put the MathML in it,
// and add it to the frame.
// When all the jax are processed, call the callback.
//
HandleMML: function (state) {
var m = state.jax.length, jax, mml, frame, span;
while (state.i < m) {
jax = state.jax[state.i];
frame = document.getElementById(jax.inputID+"-Frame");
if (jax.outputJax !== "NativeMML" && frame && !frame.getAttribute("data-mathml")) {
try {
mml = jax.root.toMathML("").replace(/\n */g,"").replace(/<!--.*?-->/g,"");
} catch (err) {
if (!err.restart) throw err; // an actual error
return MathJax.Callback.After(["HandleMML",this,state],err.restart);
}
frame.setAttribute("data-mathml",mml);
span = HTML.Element("span",{
isMathJax: true,
style:{
position:"absolute!important",
left:"-100000px", top:"auto", height:"1px", width:"1px",
"padding-top":"1px", display:"block"
}
});
span.innerHTML = mml;
frame.appendChild(span);
}
state.i++;
}
state.callback();
},
//
// The hook for the End Math signal.
// This sets up a state object that lists the jax and index into the jax,
// and a dummy callback that is used to synchronizing with MathJax.
// It will be called when the jax are all processed, and that will
// let the MathJax queue continue (it will block until then).
//
EndMathHook: function (node) {
var state = {
jax: HUB.getAllJax(node), i: 0,
callback: MathJax.Callback(function () {
console.log("MathML time: "+((new Date().getTime())-state.start));
}),
start: new Date().getTime()
};
this.HandleMML(state);
return state.callback;
}
};
//
// Call the hook when math has been processed.
//
HUB.Register.MessageHook("End Math",function (msg) {AssistiveMML.EndMathHook(msg[1])});
HUB.Startup.signal.Post("AssistiveMML Ready");
})(MathJax.Ajax,MathJax.Callback,MathJax.Hub,MathJax.HTML);
//
// Make sure the toMathML extension is loaded before we signal
// the load complete for this extension.
//
MathJax.Callback.Queue(
["Require",MathJax.Ajax,"[MathJax]/extensions/toMathML.js"],
["loadComplete",MathJax.Ajax,"[MathJax]/extensions/AssistiveMML.js"]
);