48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
import {displayError} from './common.js';
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function targetElement(el) {
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// The target element is either the current element if it has the
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// `is-loading` class or the pre that contains it
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return el.classList.contains('is-loading') ? el : el.closest('pre');
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}
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export async function renderMath() {
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const els = document.querySelectorAll('.markup code.language-math');
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if (!els.length) return;
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const [{default: katex}] = await Promise.all([
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import(/* webpackChunkName: "katex" */'katex'),
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import(/* webpackChunkName: "katex" */'katex/dist/katex.css'),
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]);
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const MAX_CHARS = 1000;
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const MAX_SIZE = 25;
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const MAX_EXPAND = 1000;
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for (const el of els) {
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const target = targetElement(el);
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if (target.hasAttribute('data-render-done')) continue;
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const source = el.textContent;
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if (source.length > MAX_CHARS) {
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displayError(target, new Error(`Math source of ${source.length} characters exceeds the maximum allowed length of ${MAX_CHARS}.`));
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continue;
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}
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const displayMode = el.classList.contains('display');
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const nodeName = displayMode ? 'p' : 'span';
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try {
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const tempEl = document.createElement(nodeName);
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katex.render(source, tempEl, {
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maxSize: MAX_SIZE,
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maxExpand: MAX_EXPAND,
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displayMode,
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});
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target.replaceWith(tempEl);
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} catch (error) {
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displayError(target, error);
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}
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}
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}
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