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35 lines
1.0 KiB
JavaScript
35 lines
1.0 KiB
JavaScript
function makeUnique(hash, unique, i = 1) {
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const uniqueHash = i === 1 ? hash : `${hash}-${i}`;
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if (!unique[uniqueHash]) {
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unique[uniqueHash] = true;
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return uniqueHash;
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}
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return makeUnique(hash, unique, i + 1);
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}
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/**
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* @param {string} text - HTML from e.g. parseMarkdown#render
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* @param {Record<string, boolean>} [unique] - Ensures that each output is unique in `unique`
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* @returns {string} that is safe to use in fragment links
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*/
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export default function textToHash(text, unique = {}) {
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return makeUnique(
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encodeURI(
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text
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.toLowerCase()
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.replace(/<\/?[^>]+(>|$)/g, '') // remove HTML
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.replace(/=>|<| \/>|<code>|<\/code>|'/g, '')
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.replace(/[!@#$%^&*()=_+[\]{}`~;:'"|,.<>/?\s]+/g, '-')
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.replace(
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/([\uE000-\uF8FF]|\uD83C[\uDC00-\uDFFF]|\uD83D[\uDC00-\uDFFF]|[\u2011-\u26FF]|\uD83E[\uDD10-\uDDFF])\uFE0F?/g,
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'',
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) // remove emojis
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.replace(/-+/g, '-')
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.replace(/^-|-$/g, ''),
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),
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unique,
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);
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}
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