Function codePointToString

tools/scripts/utils.js:13–20

(codePoint)

const lowSurrogate = (codePoint) => ((codePoint - 0x10000) % 0x400) + 0xDC00;

const codePointToString = (codePoint) => {
    const string = String.fromCodePoint(codePoint);
    // Important: escape RegExp meta-characters.
    if (/[$()*+\-\./?\[\]^{|}]/.test(string)) {
        return `\\${string}`;
    }
    return string;
};

const createRange = (codePoints) => {
    // Does the range contain lone high surrogates?