100 lines
2.5 KiB
JavaScript
100 lines
2.5 KiB
JavaScript
/*\
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title: $:/plugins/tiddlywiki/katex/wrapper.js
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type: application/javascript
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module-type: widget
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Wrapper for `katex.min.js` that provides a `<$latex>` widget. It is also available under the alias `<$katex>`
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var katex = require("$:/plugins/tiddlywiki/katex/katex.min.js"),
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chemParse = require("$:/plugins/tiddlywiki/katex/mhchem.min.js"),
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Widget = require("$:/core/modules/widgets/widget.js").widget;
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katex.macros = {};
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katex.updateMacros = function() {
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var tiddlers = $tw.wiki.getTiddlersWithTag("$:/tags/KaTeX/Macro"),
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regex = /#\d/g, // Remove the arguments like #1#2
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tid, macro, cmd;
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for (var i=0; i < tiddlers.length; i++) {
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tid = $tw.wiki.getTiddler(tiddlers[i]);
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try {
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macro = tid.fields["caption"];
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macro = macro.replace(regex, "");
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cmd = tid.fields["text"];
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katex.macros[macro] = cmd;
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} catch(ex) {// Catch the bad ones
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};
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};
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};
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var KaTeXWidget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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};
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/*
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Inherit from the base widget class
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*/
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KaTeXWidget.prototype = new Widget();
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/*
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Render this widget into the DOM
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*/
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KaTeXWidget.prototype.render = function(parent,nextSibling) {
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// Housekeeping
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this.parentDomNode = parent;
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this.computeAttributes();
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this.execute();
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// Get the source text
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var text = this.getAttribute("text",this.parseTreeNode.text || "");
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var displayMode = this.getAttribute("displayMode",this.parseTreeNode.displayMode || "false") === "true";
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katex.updateMacros();
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// Render it into a span
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var span = this.document.createElement("span"),
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options = {throwOnError: false, displayMode: displayMode, macros: katex.macros};
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try {
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if(!this.document.isTiddlyWikiFakeDom) {
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katex.render(text,span,options);
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} else {
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span.innerHTML = katex.renderToString(text,options);
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}
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} catch(ex) {
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span.className = "tc-error";
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span.textContent = ex;
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}
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// Insert it into the DOM
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parent.insertBefore(span,nextSibling);
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this.domNodes.push(span);
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};
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/*
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Compute the internal state of the widget
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*/
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KaTeXWidget.prototype.execute = function() {
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// Nothing to do for a katex widget
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};
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/*
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Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
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*/
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KaTeXWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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if(changedAttributes.text) {
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this.refreshSelf();
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return true;
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} else {
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return false;
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}
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};
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exports.latex = KaTeXWidget;
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exports.katex = KaTeXWidget;
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})();
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