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