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// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt Apache-2.0
/*************************************************************
*
* [Contrib]/a11y/semantic-enrich.js
*
* An extension that connects MathJax to the Speech-Rule-Engine
* to produce semantically enriched MathML.
*
* ---------------------------------------------------------------------
*
* Copyright (c) 2016-2017 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.
*/
MathJax.Extension["semantic-enrich"] = {
version: "1.6.0",
config: MathJax.Hub.CombineConfig("semantic-enrich",{disabled: false}),
dependents: [], // the extensions that depend on this one
running: false,
//
// Names of attributes to force if set by mstyle
// (so SRE doesn't have to look these up)
//
mstyleLookup: {
mi: ["mathvariant"],
mo: ["mathvariant","accent","largeop","form","fence","separator","movablelimits"],
mn: ["mathvariant"],
mtext: ["mathvariant"],
ms: ["mathvariant"],
mfrac: ["linethickness"],
mfenced: ["open","close","separators"],
menclose: ["notation"],
munder: ["accentunder"],
mover: ["accent"],
munderover: ["accent","accentunder"]
},
//
// If we are not disabled,
// Get the enriched MathML and parse it into the jax root.
// Mark the jax as enriched.
//
Filter: function (jax,id,script) {
delete jax.enriched;
if (this.config.disabled) return;
try {
this.running = true;
var mml = sre.Enrich.semanticMathmlSync(jax.root.toMathML());
jax.root = MathJax.InputJax.MathML.Parse.prototype.MakeMML(mml);
jax.root.inputID = script.id;
jax.enriched = true;
this.running = false;
} catch (err) {
this.running = false;
throw err;
}
},
//
// Functions to enable and disabled enrichment.
//
Enable: function (update,menu) {
this.config.disabled = false;
if (update) MathJax.Hub.Queue(["Reprocess",MathJax.Hub]);
},
Disable: function (update,menu) {
this.config.disabled = true;
for (var i = this.dependents.length-1; i >= 0; i--) {
var dependent = this.dependents[i];
if (dependent.Disable) dependent.Disable(false,menu);
}
if (update) MathJax.Hub.Queue(["Reprocess",MathJax.Hub]);
},
//
// Register a dependent
//
Dependent: function (extension) {
this.dependents.push(extension);
}
};
(function () {
//
// Set up the a11y path,if it isn't already in place
//
var PATH = MathJax.Ajax.config.path;
if (!PATH.a11y) PATH.a11y = HUB.config.root + "/extensions/a11y";
//
// Load SRE and use the signal to tell MathJax when it is loaded.
// Since SRE waits for the mml element jax, load that too.
//
if (!PATH.SRE) PATH.SRE = MathJax.Ajax.fileURL(PATH.a11y);
MathJax.Ajax.Load("[SRE]/mathjax-sre.js");
MathJax.Hub.Register.StartupHook("Sre Ready",["loadComplete",MathJax.Ajax,"[SRE]/mathjax-sre.js"]);
})();
//
// Make a queue so that the MathML jax and SRE are both loaded before
// we install the filter and signal that we are ready. The MathML config.js
// file must load before loading its jax.js file.
//
MathJax.Callback.Queue(
//
// Load mml jax
//
["Require",MathJax.Ajax,"[MathJax]/jax/element/mml/jax.js"],
//
// Load MathML input jax (since we need Parse.MakeMML)
//
["Require",MathJax.Ajax,"[MathJax]/jax/input/MathML/config.js"],
["Require",MathJax.Ajax,"[MathJax]/jax/input/MathML/jax.js"],
//
// Load toMathML extension (if it isn't already)
//
["Require",MathJax.Ajax,"[MathJax]/extensions/toMathML.js"],
//
// Wait for SRE (which waits for mml jax) before modifying mbase
//
MathJax.Hub.Register.StartupHook("Sre Ready",function () {
var MML = MathJax.ElementJax.mml,
ENRICH = MathJax.Extension["semantic-enrich"];
//
// Override toMathML's attribute function to include additional
// attributes inherited from mstyle (so SRE doesn't have to look them
// up itself). Eventually, this should be moved to toMathML.js directly.
//
MML.mbase.Augment({
toMathMLattributes: function () {
var defaults = (this.type === "mstyle" ? MML.math.prototype.defaults : this.defaults);
var names = (this.attrNames||MML.copyAttributeNames),
skip = MML.skipAttributes, copy = MML.copyAttributes,
lookup = (ENRICH.running ? ENRICH.mstyleLookup[this.type]||[] : []);
var attr = [], ATTR = (this.attr||{});
if (this.type === "math" && (!this.attr || !('xmlns' in this.attr)))
attr.push('xmlns="http://www.w3.org/1998/Math/MathML"');
if (!this.attrNames) {
for (var id in defaults) {if (!skip[id] && !copy[id] && defaults.hasOwnProperty(id)) {
if (this[id] != null && this[id] !== defaults[id]) {
if (this.Get(id,null,1) !== this[id]) this.toMathMLaddAttr(attr,id,this[id]);
}
}}
}
for (var i = 0, m = names.length; i < m; i++) {
if (copy[names[i]] === 1 && !defaults.hasOwnProperty(names[i])) continue;
value = ATTR[names[i]]; if (value == null) value = this[names[i]];
if (value != null) this.toMathMLaddAttr(attr,names[i],value);
}
for (i = 0, m = lookup.length; i < m; i++) {
id = lookup[i];
if (defaults.hasOwnProperty(id) && !attr["_"+id]) {
value = this.Get(id,1);
if (value != null) this.toMathMLaddAttr(attr,id,value);
}
}
this.toMathMLclass(attr);
if (attr.length) return " "+attr.join(" "); else return "";
},
toMathMLaddAttr: function (attr,id,value) {
attr.push(id+'="'+this.toMathMLquote(value)+'"');
attr["_"+id] = 1;
}
});
//
// Adjust setTeXclass for <mo> so that added elements don't
// cause unwanted space.
//
var TEXCLASS = MML.mo.prototype.setTeXclass;
MML.mo.Augment({
setTeXclass: function (prev) {
var values = this.getValues("form","lspace","rspace"); // sets useMMLspacing
if (this.useMMLspacing) {
this.texClass = MML.TEXCLASS.NONE;
return this;
}
if (this.attr && this.attr["data-semantic-added"]) {
this.texClass = this.prevClass = MML.TEXCLASS.NONE;
return prev;
}
return TEXCLASS.apply(this,arguments);
}
});
}),
function () {
//
// Install enrichment filter, and signal that we are ready.
//
MathJax.Hub.postInputHooks.Add(["Filter",MathJax.Extension["semantic-enrich"]],50);
MathJax.Hub.Startup.signal.Post("Semantic Enrich Ready");
MathJax.Ajax.loadComplete("[a11y]/semantic-enrich.js");
}
);
// @license-end
|
