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attic.social / src / lib / escape.ts

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 1const escapeEntities = new Map([
 2  ["&", "&amp;"],
 3  ["<", "&lt;"],
 4  [">", "&gt;"],
 5  ['"', "&quot;"],
 6  ["'", "&#39;"],
 7]);
 8
 9const unescapeEntities = new Map([
10  ["&amp;", "&"],
11  ["&lt;", "<"],
12  ["&gt;", ">"],
13  ["&quot;", '"'],
14  ["&#39;", "'"],
15]);
16
17const escapeKeys = new RegExp([...escapeEntities.keys()].join("|"), "g");
18const unescapeKeys = new RegExp([...unescapeEntities.keys()].join("|"), "g");
19
20/** Escape HTML entities */
21export const escape = (str: string): string =>
22  str.replaceAll(escapeKeys, (k) => escapeEntities.get(k)!);
23
24/** Unescape HTML entities */
25export const unescape = (str: string): string =>
26  str.replaceAll(unescapeKeys, (k) => unescapeEntities.get(k)!);
27
28/** Unescape and escape HTML entities */
29export const reEscape = (str: string) => escape(unescape(str));