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import {displayError} from './common.ts';
function targetElement(el: Element): {target: Element, displayAsBlock: boolean} {
// The target element is either the parent "code block with loading indicator", or itself
// It is designed to work for 2 cases (guaranteed by backend code):
// * <pre class="code-block is-loading"><code class="language-math display">...</code></pre>
// * <code class="language-math">...</code>
return {
target: el.closest('.code-block.is-loading') ?? el,
displayAsBlock: el.classList.contains('display'),
};
}
export async function renderMath(): Promise<void> {
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'),
]);
const MAX_CHARS = 1000;
const MAX_SIZE = 25;
const MAX_EXPAND = 1000;
for (const el of els) {
const {target, displayAsBlock} = targetElement(el);
if (target.hasAttribute('data-render-done')) continue;
const source = el.textContent;
if (source.length > MAX_CHARS) {
displayError(target, new Error(`Math source of ${source.length} characters exceeds the maximum allowed length of ${MAX_CHARS}.`));
continue;
}
try {
const tempEl = document.createElement(displayAsBlock ? 'p' : 'span');
katex.render(source, tempEl, {
maxSize: MAX_SIZE,
maxExpand: MAX_EXPAND,
displayMode: displayAsBlock, // katex: true for display (block) mode, false for inline mode
});
target.replaceWith(tempEl);
} catch (error) {
displayError(target, error);
}
}
}
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