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// Adapted from https://github.com/mathiasbynens/he/blob/36afe179392226cf1b6ccdb16ebbb7a5a844d93a/src/he.js#L106-L134
const decodeMap = new Map([
[0, 65_533],
// C1 Unicode control character reference replacements
[128, 8364],
[130, 8218],
[131, 402],
[132, 8222],
[133, 8230],
[134, 8224],
[135, 8225],
[136, 710],
[137, 8240],
[138, 352],
[139, 8249],
[140, 338],
[142, 381],
[145, 8216],
[146, 8217],
[147, 8220],
[148, 8221],
[149, 8226],
[150, 8211],
[151, 8212],
[152, 732],
[153, 8482],
[154, 353],
[155, 8250],
[156, 339],
[158, 382],
[159, 376],
]);
/**
* Polyfill for `String.fromCodePoint`. It is used to create a string from a Unicode code point.
*/
export const fromCodePoint: (...codePoints: number[]) => string =
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition, n/no-unsupported-features/es-builtins
String.fromCodePoint ??
function (codePoint: number): string {
let output = "";
if (codePoint > 0xff_ff) {
codePoint -= 0x1_00_00;
output += String.fromCharCode(
((codePoint >>> 10) & 0x3_ff) | 0xd8_00,
);
codePoint = 0xdc_00 | (codePoint & 0x3_ff);
}
output += String.fromCharCode(codePoint);
return output;
};
/**
* Replace the given code point with a replacement character if it is a
* surrogate or is outside the valid range. Otherwise return the code
* point unchanged.
*/
export function replaceCodePoint(codePoint: number): number {
if (
(codePoint >= 0xd8_00 && codePoint <= 0xdf_ff) ||
codePoint > 0x10_ff_ff
) {
return 0xff_fd;
}
return decodeMap.get(codePoint) ?? codePoint;
}
/**
* Replace the code point if relevant, then convert it to a string.
*
* @deprecated Use `fromCodePoint(replaceCodePoint(codePoint))` instead.
* @param codePoint The code point to decode.
* @returns The decoded code point.
*/
export function decodeCodePoint(codePoint: number): string {
return fromCodePoint(replaceCodePoint(codePoint));
}
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