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/* eslint-disable func-names, space-before-function-paren, consistent-return, no-var, no-else-return, prefer-arrow-callback, max-len, no-console */
/* global katex */
// Renders math using KaTeX in any element with the
// `js-render-math` class
//
// ### Example Markup
//
// <code class="js-render-math"></div>
//
(function() {
// Only load once
var katexLoaded = false;
// Loop over all math elements and render math
var renderWithKaTeX = function (elements) {
elements.each(function () {
var mathNode = $('<span></span>');
var $this = $(this);
var display = $this.attr('data-math-style') === 'display';
try {
katex.render($this.text(), mathNode.get(0), { displayMode: display });
mathNode.insertAfter($this);
$this.remove();
} catch (err) {
// What can we do??
console.log(err.message);
}
});
};
$.fn.renderMath = function() {
var $this = this;
if ($this.length === 0) return;
if (katexLoaded) renderWithKaTeX($this);
else {
// Request CSS file so it is in the cache
$.get(gon.katex_css_url, function() {
var css = $('<link>',
{ rel: 'stylesheet',
type: 'text/css',
href: gon.katex_css_url,
});
css.appendTo('head');
// Load KaTeX js
$.getScript(gon.katex_js_url, function() {
katexLoaded = true;
renderWithKaTeX($this); // Run KaTeX
});
});
}
};
}).call(window);
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