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21 lines
558 B
21 lines
558 B
5 years ago
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'use strict';
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// https://mathiasbynens.be/notes/javascript-encoding
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// https://github.com/bestiejs/punycode.js - punycode.ucs2.decode
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module.exports = function ucs2length(str) {
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var length = 0
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, len = str.length
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, pos = 0
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, value;
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while (pos < len) {
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length++;
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value = str.charCodeAt(pos++);
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if (value >= 0xD800 && value <= 0xDBFF && pos < len) {
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// high surrogate, and there is a next character
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value = str.charCodeAt(pos);
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if ((value & 0xFC00) == 0xDC00) pos++; // low surrogate
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}
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}
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return length;
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};
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