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import katex from 'katex';
// Adapted from https://github.com/SchneeHertz/markdown-it-katex-gpt
// MIT license
const defaultOptions = {
delimiters: [
{ left: '\\[', right: '\\]', display: true },
{ left: '\\(', right: '\\)', display: false },
],
};
export function renderLatexHTML(content, display = false) {
return katex.renderToString(content, {
throwOnError: false,
output: 'mathml',
displayMode: display,
});
}
function escapedBracketRule(options) {
return (state, silent) => {
const max = state.posMax;
const start = state.pos;
for (const { left, right, display } of options.delimiters) {
// Check if it starts with the left delimiter
if (!state.src.slice(start).startsWith(left)) continue;
// Skip the length of the left delimiter
let pos = start + left.length;
// Find the matching right delimiter
while (pos < max) {
if (state.src.slice(pos).startsWith(right)) {
break;
}
pos++;
}
// No matching right delimiter found, skip to the next match
if (pos >= max) continue;
// If not in silent mode, convert LaTeX formula to MathML
if (!silent) {
const content = state.src.slice(start + left.length, pos);
try {
const renderedContent = renderLatexHTML(content, display);
const token = state.push('html_inline', '', 0);
token.content = renderedContent;
} catch (e) {
console.error(e);
}
}
// Update position, skip the length of the right delimiter
state.pos = pos + right.length;
return true;
}
}
}
export default function (md, options = defaultOptions) {
md.inline.ruler.after('text', 'escaped_bracket', escapedBracketRule(options));
}
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