88c2e24360
This PR adds mathematical rendering with KaTeX. The first step is to add a Goldmark extension that detects the latex (and tex) mathematics delimiters. The second step to make this extension only run if math support is enabled. The second step is to then add KaTeX CSS and JS to the head which will load after the dom is rendered. Fix #3445 Signed-off-by: Andrew Thornton <art27@cantab.net> Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
38 lines
1.2 KiB
JavaScript
38 lines
1.2 KiB
JavaScript
function displayError(el, err) {
|
|
const target = targetElement(el);
|
|
target.remove('is-loading');
|
|
const errorNode = document.createElement('div');
|
|
errorNode.setAttribute('class', 'ui message error markup-block-error mono');
|
|
errorNode.textContent = err.str || err.message || String(err);
|
|
target.before(errorNode);
|
|
}
|
|
|
|
function targetElement(el) {
|
|
// The target element is either the current element if it has the `is-loading` class or the pre that contains it
|
|
return el.classList.contains('is-loading') ? el : el.closest('pre');
|
|
}
|
|
|
|
export async function renderMath() {
|
|
const els = document.querySelectorAll('.markup code.language-math');
|
|
if (!els.length) return;
|
|
|
|
const [{default: katex}] = await Promise.all([
|
|
import(/* webpackChunkName: "katex" */'katex'),
|
|
import(/* webpackChunkName: "katex" */'katex/dist/katex.css'),
|
|
]);
|
|
|
|
for (const el of els) {
|
|
const source = el.textContent;
|
|
const options = {display: el.classList.contains('display')};
|
|
|
|
try {
|
|
const markup = katex.renderToString(source, options);
|
|
const tempEl = document.createElement(options.display ? 'p' : 'span');
|
|
tempEl.innerHTML = markup;
|
|
targetElement(el).replaceWith(tempEl);
|
|
} catch (error) {
|
|
displayError(el, error);
|
|
}
|
|
}
|
|
}
|