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20 lines
558 B
20 lines
558 B
'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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