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TiddlyWiki5/plugins/tiddlywiki/katex/wrapper.js

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/*\
title: $:/plugins/tiddlywiki/katex/wrapper.js
type: application/javascript
module-type: widget
Wrapper for `katex.min.js` that provides a `<$latex>` widget. It is also available under the alias `<$katex>`
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var katex = require("$:/plugins/tiddlywiki/katex/katex.min.js"),
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chemParse = require("$:/plugins/tiddlywiki/katex/mhchem.min.js"),
Widget = require("$:/core/modules/widgets/widget.js").widget;
// Add \ce, \pu, and \tripledash to the KaTeX macros.
katex.__defineMacro("\\ce", function(context) {
return chemParse(context.consumeArgs(1)[0], "ce")
});
katex.__defineMacro("\\pu", function(context) {
return chemParse(context.consumeArgs(1)[0], "pu");
});
// Needed for \bond for the ~ forms
// Raise by 2.56mu, not 2mu. We're raising a hyphen-minus, U+002D, not
// a mathematical minus, U+2212. So we need that extra 0.56.
katex.__defineMacro("\\tripledash", "{\\vphantom{-}\\raisebox{2.56mu}{$\\mkern2mu"
+ "\\tiny\\text{-}\\mkern1mu\\text{-}\\mkern1mu\\text{-}\\mkern2mu$}}");
var KaTeXWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
KaTeXWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
KaTeXWidget.prototype.render = function(parent,nextSibling) {
// Housekeeping
this.parentDomNode = parent;
this.computeAttributes();
this.execute();
// Get the source text
var text = this.getAttribute("text",this.parseTreeNode.text || "");
var displayMode = this.getAttribute("displayMode",this.parseTreeNode.displayMode || "false") === "true";
// Render it into a span
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var span = this.document.createElement("span"),
options = {throwOnError: false, displayMode: displayMode};
try {
if(!this.document.isTiddlyWikiFakeDom) {
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katex.render(text,span,options);
} else {
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span.innerHTML = katex.renderToString(text,options);
}
} catch(ex) {
span.className = "tc-error";
span.textContent = ex;
}
// Insert it into the DOM
parent.insertBefore(span,nextSibling);
this.domNodes.push(span);
};
/*
Compute the internal state of the widget
*/
KaTeXWidget.prototype.execute = function() {
// Nothing to do for a katex widget
};
/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
KaTeXWidget.prototype.refresh = function(changedTiddlers) {
var changedAttributes = this.computeAttributes();
if(changedAttributes.text) {
this.refreshSelf();
return true;
} else {
return false;
}
};
exports.latex = KaTeXWidget;
exports.katex = KaTeXWidget;
})();