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// MarkedJs: renders Markdown

// https://github.com/markedjs/marked

import marked from 'marked';

// KaTex: renders Math

// https://github.com/KaTeX/KaTeX

import katex from 'katex';

import 'katex/dist/katex.min.css';

// Render Markdown with imported marked compiler

function renderMarkdown(md) {

// TODO: add error handling and output sanitization

let settings = {

headerIds: true,

breaks: true,

};

return marked(md, settings);

}

// Render Math with Katex

function renderMath(math) {

// TODO: definitely add error handling.

return katex.renderToString(math, {

macros: { '\\f': '#1f(#2)' },

});

}

function runPython(pyvm, code, error) {

try {

pyvm.exec(code);

} catch (err) {

handlePythonError(error, err);

}

function handlePythonError(errorElem, err) {

if (err instanceof WebAssembly.RuntimeError) {

err = window.__RUSTPYTHON_ERROR || err;

}

errorElem.textContent = err;

}

function addCSS(code) {

let style = document.createElement('style');

style.type = 'text/css';

style.innerHTML = code;

// add a data attribute to check if css already loaded

style.dataset.status = 'loaded';

document.getElementsByTagName('head')[0].appendChild(style);

}

function checkCssStatus() {

let style = document.getElementsByTagName('style')[0];

if (!style) {

return 'none';

} else {

return style.dataset.status;

}

async function runJS(code) {

const script = document.createElement('script');

const doc = document.body || document.documentElement;

const blob = new Blob([code], { type: 'text/javascript' });

const url = URL.createObjectURL(blob);

script.src = url;

const scriptLoaded = new Promise((resolve) => {

script.addEventListener('load', resolve);

});

doc.appendChild(script);

try {

URL.revokeObjectURL(url);

doc.removeChild(script);

await scriptLoaded;

} catch (e) {

// ignore if body is changed and script is detached

console.log(e);

}

export {

runPython,

handlePythonError,

runJS,

renderMarkdown,

renderMath,

addCSS,

checkCssStatus,

};

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