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Add CHTML-preview extension that uses the CommonHTML output jax to create fast previews that are replaced (more slowly) by the normal output jax.

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Davide P. Cervone 2014-08-16 09:26:47 -04:00
parent 3463017f85
commit 05c7aace26
1 changed files with 107 additions and 0 deletions
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unpacked/extensions/CHTML-preview.js Normal file
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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/CHTML-preview.js
*
* Implements a fast preview using the Common-HTML output jax
* and then a slower update to the more accurate HTML-CSS output
* (or whatever the user has selected).
*
* ---------------------------------------------------------------------
*
* Copyright (c) 2014 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 (HUB,HTML) {
var CHTMLpreview = MathJax.Extension["CHTML-preview"] = {
version: "1.0",
//
// Configuration for the chinking of the main output
// after the previews have been created
//
config: HUB.CombineConfig("CHTML-preview",{
EqnChunk: 5, EqnChunkFactor: 1, EqnChunkDelay: 100
}),
//
// Ajust the chunking of the output jax
//
Config: function () {
var config = this.config;
HUB.Config({
"HTML-CSS": {
EqnChunk: config.EqnChunk,
EqnChunkFactor: config.EqnChunkFactor,
EqnChunkDelay: config.EqnChunkDelay
},
"SVG": {
EqnChunk: config.EqnChunk,
EqnChunkFactor: config.EqnChunkFactor,
EqnChunkDelay: config.EqnChunkDelay
}
});
},
//
// Insert a preview span, if there isn't one already,
// and call the CommonHTML output jax to create the preview
//
Preview: function (data) {
var preview = data.script.previousSibling;
if (!preview || preview.className !== MathJax.Hub.config.preRemoveClass) {
preview = HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass});
data.script.parentNode.insertBefore(preview,data.script);
}
preview.innerHTML = "";
data.math.root.toCommonHTML(preview);
return data;
},
//
// Hook into the inut jax postFilter to create the previews as
// the input jax are processed.
//
Register: function (name) {
HUB.Register.StartupHook(name+" Jax Require",function () {
var jax = MathJax.InputJax[name];
var delay = HUB.config.delayJaxRegistration;
HUB.config.delayJaxRegistration = true;
HUB.Register.StartupHook(name+" Jax Ready",function () {HUB.config.delayJaxRegistration = delay});
jax.require.push(
"[MathJax]/jax/output/CommonHTML/config.js",
"[MathJax]/jax/output/CommonHTML/jax.js"
);
jax.postfilterHooks.Add(["Preview",MathJax.Extension["CHTML-preview"]]);
});
}
}
//
// Hook into each input jax
//
CHTMLpreview.Register("TeX");
CHTMLpreview.Register("MathML");
CHTMLpreview.Register("AsciiMath");
HUB.Register.StartupHook("End Config",["Config",CHTMLpreview]);
})(MathJax.Hub,MathJax.HTML);
MathJax.Ajax.loadComplete("[MathJax]/extensions/CHTML-preview.js");