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/* eslint-disable consistent-return */
// Syntax Highlighter
//
// Applies a syntax highlighting color scheme CSS class to any element with the
// `js-syntax-highlight` class
//
// ### Example Markup
//
// <div class="js-syntax-highlight"></div>
//
export default function syntaxHighlight($els = null) {
if (!$els) return;
const els = $els.get ? $els.get() : $els;
const handler = (el) => {
if (el.classList.contains('js-syntax-highlight')) {
// Given the element itself, apply highlighting
return el.classList.add(gon.user_color_scheme);
}
// Given a parent element, recurse to any of its applicable children
const children = el.querySelectorAll('.js-syntax-highlight');
if (children.length) {
return syntaxHighlight(children);
}
};
// In order to account for NodeList returned by document.querySelectorAll,
// we should rather check whether the els object is iterable
// instead of relying on Array.isArray()
const isIterable = typeof els[Symbol.iterator] === 'function';
if (isIterable) {
els.forEach((el) => handler(el));
} else {
handler(els);
}
}
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