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const loadingDiv = document.getElementById("loading");
const langSelect = document.getElementById("lang");
const styleSelect = document.getElementById("style");
const formatterSelect = document.getElementById("formatter");
const outputDiv = document.getElementById("hlcode");
const codeHeader = document.getElementById("code-header");
const copyLink = document.getElementById("copylink");
const style = document.getElementById("css-style");
const textarea = document.getElementById("code");
const uriTooLongMsg = document.getElementById('uri-too-long');
const contrastWarning = document.getElementById('contrast-warning');
const fileInput = document.getElementById("file");
const fileInputResetButton = document.getElementById('reset-file');
const qvars = Object.fromEntries(new URLSearchParams(window.location.search));
if (qvars.lexer) {
langSelect.value = qvars.lexer;
}
if (qvars.code !== undefined) {
textarea.value = qvars.code;
loadingDiv.hidden = false;
}
if (qvars.style !== undefined) {
styleSelect.value = qvars.style;
updateContrastWarning();
}
if (qvars.formatter !== undefined) {
formatterSelect.value = qvars.formatter;
}
styleSelect.addEventListener('change', () => {
if (!styles)
// Worker has not loaded yet.
return;
style.textContent = styles.get(styleSelect.value);
updateCopyLink();
updateContrastWarning();
});
function updateContrastWarning() {
contrastWarning.hidden = styleSelect.selectedOptions[0].dataset.wcag == 'aa';
}
function debounce(func, timeout) {
let timer;
return (...args) => {
clearTimeout(timer);
timer = setTimeout(() => func.apply(this, args), timeout);
};
}
const highlightShortDebounce = debounce(highlight, 50);
const highlightLongDebounce = debounce(highlight, 500);
function debouncedUpdate() {
if (fileInput.files.length > 0)
return;
if (textarea.value.length < 1000) {
highlightShortDebounce();
} else {
highlightLongDebounce();
}
}
langSelect.addEventListener('change', debouncedUpdate);
textarea.addEventListener('input', debouncedUpdate);
formatterSelect.addEventListener('change', debouncedUpdate);
fileInput.addEventListener('change', () => {
fileInputResetButton.hidden = false;
highlight();
});
fileInputResetButton.hidden = fileInput.files.length == 0;
fileInputResetButton.addEventListener('click', () => {
fileInputResetButton.hidden = true;
fileInput.value = '';
highlight();
});
let styles;
const highlightWorker = new Worker("/_static/demo-worker.js");
highlightWorker.onmessage = (msg) => {
if (msg.data.loaded) {
styles = msg.data.loaded.styles;
if (qvars.code !== undefined || textarea.value) {
loadingDiv.hidden = true;
highlight();
}
} else if (msg.data.html) {
outputDiv.innerHTML = msg.data.html;
codeHeader.hidden = false;
loadingDiv.hidden = true;
style.textContent = styles.get(styleSelect.value);
} else if (msg.data.tokens) {
const table = document.createElement('table');
table.className = 'tokens';
for (const [tokenType, value] of msg.data.tokens) {
const tr = document.createElement('tr');
const td1 = document.createElement('td');
td1.textContent = tokenType.join('.');
const td2 = document.createElement('td');
const inlineCode = document.createElement('code');
inlineCode.textContent = value;
td2.appendChild(inlineCode);
tr.appendChild(td1);
tr.appendChild(td2);
table.appendChild(tr);
}
outputDiv.innerHTML = '';
outputDiv.appendChild(table);
codeHeader.hidden = false;
loadingDiv.hidden = true;
} else if (msg.data.lexer) {
highlight(msg.data.lexer);
} else {
console.warn('unexpected message from highlight worker', msg);
}
};
function updateCopyLink() {
var url = document.location.origin + document.location.pathname +
"?" + new URLSearchParams({
lexer: langSelect.value,
style: styleSelect.value,
formatter: formatterSelect.value,
code: textarea.value,
}).toString()
if (url.length > 8201) {
// pygments.org is hosted on GitHub pages which does not support URIs longer than 8201
copyLink.hidden = true;
uriTooLongMsg.hidden = false;
} else {
copyLink.href = url;
copyLink.textContent = 'Copy link';
copyLink.hidden = false;
uriTooLongMsg.hidden = true;
}
}
async function highlight(guessedLexer) {
var lexer = langSelect.value || guessedLexer;
var file = fileInput.files[0];
let code;
if (file) {
code = await file.arrayBuffer();
} else {
code = textarea.value;
}
loadingDiv.hidden = false;
if (!lexer) {
const guess_lexer = {code};
if (file)
guess_lexer.filename = file.name;
highlightWorker.postMessage({guess_lexer});
document.getElementById('loading-text').textContent = 'guessing lexer...';
return;
}
document.getElementById('loading-text').textContent = 'highlighting code...';
document.getElementById('guessed-lexer').textContent = guessedLexer;
highlightWorker.postMessage({highlight: {code, lexer, formatter: formatterSelect.value}});
if (code instanceof ArrayBuffer) {
copyLink.hidden = true;
uriTooLongMsg.hidden = true;
} else {
updateCopyLink();
}
}
copyLink.addEventListener('click', async (e) => {
e.preventDefault();
await navigator.clipboard.writeText(e.target.href);
});
function download_code() {
var filename = "highlighted.html";
var hlcode = document.getElementById("hlcode").innerHTML + style.outerHTML;
var blob = new Blob([hlcode], {type: 'text/html'});
if (window.navigator.msSaveOrOpenBlob) {
window.navigator.msSaveBlob(blob, filename);
}
else{
var elem = window.document.createElement('a');
elem.href = window.URL.createObjectURL(blob);
elem.download = filename;
document.body.appendChild(elem);
elem.click();
document.body.removeChild(elem);
window.URL.revokeObjectURL(elem.href);
}
}
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