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// https://mathiasbynens.be/notes/javascript-encoding | |
// https://github.com/bestiejs/punycode.js - punycode.ucs2.decode | |
export default function ucs2length(str: string): number { | |
const len = str.length | |
let length = 0 | |
let pos = 0 | |
let value: number | |
while (pos < len) { | |
length++ | |
value = str.charCodeAt(pos++) | |
if (value >= 0xd800 && value <= 0xdbff && pos < len) { | |
// high surrogate, and there is a next character | |
value = str.charCodeAt(pos) | |
if ((value & 0xfc00) === 0xdc00) pos++ // low surrogate | |
} | |
} | |
return length | |
} | |
ucs2length.code = 'require("ajv/dist/runtime/ucs2length").default' | |